Abstract

Using a fully quantum mechanical approach we study the optical response of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires. The translational invariance of the system allows to apply the time–dependent density functional theory (TDDFT) for nanowires of diameters up to 10 nm which is the largest size considered so far in quantum modeling of plasmonic dimers. By performing a detailed analysis of the optical extinction, induced charge densities, and near fields, we reveal the major nonlocal quantum effects determining the plasmonic modes and field enhancement in the system. These effects consist mainly of electron tunneling between the nanowires at small junction widths and dynamical screening. The TDDFT results are compared with results from classical electromagnetic calculations based on the local Drude and non-local hydrodynamic descriptions of the nanowire permittivity, as well as with results from a recently developed quantum corrected model. The latter provides a way to include quantum mechanical effects such as electron tunneling in standard classical electromagnetic simulations. We show that the TDDFT results can be thus retrieved semi-quantitatively within a classical framework. We also discuss the shortcomings of classical non-local hydrodynamic approaches. Finally, the implications of the actual position of the screening charge density at the gap interfaces are discussed in connection with plasmon ruler applications at subnanometric distances.

© 2013 OSA

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
    [CrossRef]
  2. R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
    [CrossRef]
  3. J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
    [CrossRef] [PubMed]
  4. N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
    [CrossRef] [PubMed]
  5. A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
    [CrossRef] [PubMed]
  6. H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
    [CrossRef]
  7. C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
    [CrossRef] [PubMed]
  8. J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
    [CrossRef] [PubMed]
  9. B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
    [CrossRef] [PubMed]
  10. P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
    [CrossRef] [PubMed]
  11. P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon. 1, 438–483 (2009).
    [CrossRef]
  12. T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
    [CrossRef]
  13. S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
    [CrossRef] [PubMed]
  14. M. Quinten, A. Leitner, J. R. Krenn, and F. R. Aussenegg, “Electromagnetic energy transport via linear chains of silver nanoparticles,” Opt. Lett. 23, 1331–1333 (1998).
    [CrossRef]
  15. S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
    [CrossRef] [PubMed]
  16. L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
    [CrossRef]
  17. P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
    [CrossRef]
  18. R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
    [CrossRef] [PubMed]
  19. X. Ben and H. S. Park, “Size-dependent validity bounds on the universal plasmon ruler for metal nanostructure dimers,” J. Phys. Chem. C 116, 18944–18951 (2012).
    [CrossRef]
  20. N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
    [CrossRef] [PubMed]
  21. S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
    [CrossRef] [PubMed]
  22. B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
    [CrossRef] [PubMed]
  23. R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
    [CrossRef] [PubMed]
  24. J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
    [CrossRef] [PubMed]
  25. H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
    [CrossRef] [PubMed]
  26. R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
    [CrossRef] [PubMed]
  27. M. Danckwerts and L. Novotny, “Optical frequency mixing at coupled gold nanoparticles,” Phys. Rev. Lett. 98, 026104 (2007).
    [CrossRef] [PubMed]
  28. K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
    [CrossRef] [PubMed]
  29. J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
    [CrossRef]
  30. D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
    [CrossRef] [PubMed]
  31. J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
    [CrossRef]
  32. D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
    [CrossRef] [PubMed]
  33. R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
    [CrossRef]
  34. J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
    [CrossRef]
  35. L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
    [CrossRef]
  36. T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
    [CrossRef] [PubMed]
  37. K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
    [CrossRef]
  38. F. J. García de Abajo, “Nonlocal effects in the plasmons of strongly interacting nanoparticles, dimers, and waveguides,” J. Phys. Chem. C 112, 17983–17987 (2008).
    [CrossRef]
  39. C. David and F. J. García de Abajo, “Spatial nonlocality in the optical response of metal nanoparticles,” J. Phys. Chem. C 115, 19470–19475 (2011).
    [CrossRef]
  40. J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
    [CrossRef] [PubMed]
  41. J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
    [CrossRef] [PubMed]
  42. C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
    [CrossRef] [PubMed]
  43. A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
    [CrossRef] [PubMed]
  44. A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
    [CrossRef]
  45. G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
    [CrossRef] [PubMed]
  46. G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
    [CrossRef] [PubMed]
  47. E. Hao and G. C. Schatz, “Electromagnetic fields around silver nanoparticles and dimers,” J. Chem. Phys. 120, 357–366 (2004).
    [CrossRef] [PubMed]
  48. I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
    [CrossRef] [PubMed]
  49. P. K. Jain and M. A. El-Sayed, “Plasmonic coupling in noble metal nanostructures,” Chem. Phys. Lett. 487, 153–164 (2010).
    [CrossRef]
  50. J. P. Kottmann and O. J. F. Martin, “Plasmon resonant coupling in metallic nanowires,” Optics Express 8, 655–663 (2001).
    [CrossRef] [PubMed]
  51. T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
    [CrossRef]
  52. S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
    [CrossRef]
  53. M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
    [CrossRef]
  54. O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
    [CrossRef] [PubMed]
  55. O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
    [CrossRef]
  56. M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
    [CrossRef] [PubMed]
  57. M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
    [CrossRef] [PubMed]
  58. J. P. Kottmann and O. J. F. Martin, “Retardation-induced plasmon resonances in coupled nanoparticles,” Optics Lett. 26, 1096–1098 (2001).
    [CrossRef]
  59. K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
    [CrossRef]
  60. P. K. Jain and M. A. El-Sayed, “Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model,” J. Phys. Chem. B 110, 18243–18253 (2006).
    [CrossRef] [PubMed]
  61. A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
    [CrossRef] [PubMed]
  62. C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
    [CrossRef] [PubMed]
  63. D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
    [CrossRef]
  64. C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
    [CrossRef]
  65. M. A. L. Marques and E. K. U. Gross, “Time-dependent density functional theory,” Ann. Rev. of Phys. Chem. 55, 427–455 (2004).
    [CrossRef]
  66. O. Gunnarson and B. I. Lundqvist, “Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism,” Phys. Rev. B 13, 4274–4298 (1976).
    [CrossRef]
  67. H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
    [CrossRef]
  68. P. Apell and D. R. Penn, “Optical properties of small metal spheres: surface effects,” Phys. Rev. Lett. 50, 1316–1319 (1983).
    [CrossRef]
  69. J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
    [CrossRef]
  70. J. H. Parks and S. A. McDonald, “Evolution of the collective-mode resonance in small adsorbed sodium clusters,” Phys. Rev. Lett. 62, 2301–2304 (1989).
    [CrossRef] [PubMed]
  71. J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
    [CrossRef]
  72. T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
    [CrossRef] [PubMed]
  73. P. Apell and Å. Ljungbert, “Red shift of surface plasmons in small metal particles,” Solid State Commun. 44, 1367–1369 (1982).
    [CrossRef]
  74. A. Liebsch, “Surface-plasmon dispersion and size dependence of Mie resonance: silver versus simple metals,” Phys. Rev. B 48, 11317–11328 (1993).
    [CrossRef]
  75. P. J. Feibelman, “Surface electromagnetic fields,” Progress in Surface Science 12, 287–407 (1982).
    [CrossRef]
  76. A. Liebsch, “Dynamical screening at simple-metal surfaces,” Phys. Rev. B 36, 7378–7388 (1987).
    [CrossRef]
  77. P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
    [CrossRef]
  78. R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
    [CrossRef]
  79. J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
    [CrossRef] [PubMed]
  80. A. Liebsch and W. L. Schaich, “Influence of a polarizable medium on the nonlocal optical response of a metal surface.” Phys. Rev. B 52, 14219–14234 (1995).
    [CrossRef]
  81. L. Serra and A. Rubio, “Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory,” Phys. Rev. Lett. 78, 1428–1431 (1997).
    [CrossRef]
  82. E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
    [CrossRef]
  83. E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
    [CrossRef]
  84. K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
    [CrossRef] [PubMed]
  85. A. J. Bennett, “Influence of the electron charge distribution on surface-plasmon dispersion,” Phys. Rev. B 1, 203–207 (1970).
    [CrossRef]
  86. J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
    [CrossRef]
  87. J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
    [CrossRef]
  88. S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
    [CrossRef] [PubMed]

2013 (5)

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
[CrossRef]

2012 (13)

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

X. Ben and H. S. Park, “Size-dependent validity bounds on the universal plasmon ruler for metal nanostructure dimers,” J. Phys. Chem. C 116, 18944–18951 (2012).
[CrossRef]

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

2011 (11)

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
[CrossRef] [PubMed]

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

C. David and F. J. García de Abajo, “Spatial nonlocality in the optical response of metal nanoparticles,” J. Phys. Chem. C 115, 19470–19475 (2011).
[CrossRef]

O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
[CrossRef]

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

2010 (8)

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
[CrossRef]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
[CrossRef] [PubMed]

P. K. Jain and M. A. El-Sayed, “Plasmonic coupling in noble metal nanostructures,” Chem. Phys. Lett. 487, 153–164 (2010).
[CrossRef]

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
[CrossRef]

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

2009 (8)

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon. 1, 438–483 (2009).
[CrossRef]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
[CrossRef]

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
[CrossRef] [PubMed]

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
[CrossRef] [PubMed]

2008 (3)

F. J. García de Abajo, “Nonlocal effects in the plasmons of strongly interacting nanoparticles, dimers, and waveguides,” J. Phys. Chem. C 112, 17983–17987 (2008).
[CrossRef]

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

2007 (3)

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
[CrossRef]

M. Danckwerts and L. Novotny, “Optical frequency mixing at coupled gold nanoparticles,” Phys. Rev. Lett. 98, 026104 (2007).
[CrossRef] [PubMed]

2006 (2)

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

P. K. Jain and M. A. El-Sayed, “Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model,” J. Phys. Chem. B 110, 18243–18253 (2006).
[CrossRef] [PubMed]

2005 (5)

K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
[CrossRef]

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

2004 (3)

E. Hao and G. C. Schatz, “Electromagnetic fields around silver nanoparticles and dimers,” J. Chem. Phys. 120, 357–366 (2004).
[CrossRef] [PubMed]

M. A. L. Marques and E. K. U. Gross, “Time-dependent density functional theory,” Ann. Rev. of Phys. Chem. 55, 427–455 (2004).
[CrossRef]

T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
[CrossRef]

2003 (4)

E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
[CrossRef]

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

2001 (2)

J. P. Kottmann and O. J. F. Martin, “Plasmon resonant coupling in metallic nanowires,” Optics Express 8, 655–663 (2001).
[CrossRef] [PubMed]

J. P. Kottmann and O. J. F. Martin, “Retardation-induced plasmon resonances in coupled nanoparticles,” Optics Lett. 26, 1096–1098 (2001).
[CrossRef]

1999 (1)

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

1998 (3)

M. Quinten, A. Leitner, J. R. Krenn, and F. R. Aussenegg, “Electromagnetic energy transport via linear chains of silver nanoparticles,” Opt. Lett. 23, 1331–1333 (1998).
[CrossRef]

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
[CrossRef]

1997 (1)

L. Serra and A. Rubio, “Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory,” Phys. Rev. Lett. 78, 1428–1431 (1997).
[CrossRef]

1995 (2)

A. Liebsch and W. L. Schaich, “Influence of a polarizable medium on the nonlocal optical response of a metal surface.” Phys. Rev. B 52, 14219–14234 (1995).
[CrossRef]

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

1993 (5)

A. Liebsch, “Surface-plasmon dispersion and size dependence of Mie resonance: silver versus simple metals,” Phys. Rev. B 48, 11317–11328 (1993).
[CrossRef]

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
[CrossRef]

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

1990 (1)

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

1989 (1)

J. H. Parks and S. A. McDonald, “Evolution of the collective-mode resonance in small adsorbed sodium clusters,” Phys. Rev. Lett. 62, 2301–2304 (1989).
[CrossRef] [PubMed]

1987 (1)

A. Liebsch, “Dynamical screening at simple-metal surfaces,” Phys. Rev. B 36, 7378–7388 (1987).
[CrossRef]

1984 (1)

P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
[CrossRef]

1983 (1)

P. Apell and D. R. Penn, “Optical properties of small metal spheres: surface effects,” Phys. Rev. Lett. 50, 1316–1319 (1983).
[CrossRef]

1982 (2)

P. J. Feibelman, “Surface electromagnetic fields,” Progress in Surface Science 12, 287–407 (1982).
[CrossRef]

P. Apell and Å. Ljungbert, “Red shift of surface plasmons in small metal particles,” Solid State Commun. 44, 1367–1369 (1982).
[CrossRef]

1976 (1)

O. Gunnarson and B. I. Lundqvist, “Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism,” Phys. Rev. B 13, 4274–4298 (1976).
[CrossRef]

1970 (1)

A. J. Bennett, “Influence of the electron charge distribution on surface-plasmon dispersion,” Phys. Rev. B 1, 203–207 (1970).
[CrossRef]

Acimovic, S. S.

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

Aizpurua, J.

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
[CrossRef]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

Alivisatos, A. P.

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

Allegrini, M.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Alvarez-Puebla, R.

R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
[CrossRef]

Andersen, K.

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

Antosiewicz, T. J.

R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
[CrossRef]

Apell, P.

R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
[CrossRef]

P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
[CrossRef]

P. Apell and D. R. Penn, “Optical properties of small metal spheres: surface effects,” Phys. Rev. Lett. 50, 1316–1319 (1983).
[CrossRef]

P. Apell and Å. Ljungbert, “Red shift of surface plasmons in small metal particles,” Solid State Commun. 44, 1367–1369 (1982).
[CrossRef]

Apkarian, V. A.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Arielly, R.

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

Atay, T.

T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
[CrossRef]

Atwater, H. A.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Aubry, A.

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

Aussenegg, F. R.

Bachelier, G.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Bakshi, P.

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

Banik, M.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Barnard, E. S.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Baumberg, J. J.

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Bazan, G. C.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Ben, X.

X. Ben and H. S. Park, “Size-dependent validity bounds on the universal plasmon ruler for metal nanostructure dimers,” J. Phys. Chem. C 116, 18944–18951 (2012).
[CrossRef]

Bennett, A. J.

A. J. Bennett, “Influence of the electron charge distribution on surface-plasmon dispersion,” Phys. Rev. B 1, 203–207 (1970).
[CrossRef]

Berciaud, S.

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

Bharadwaj, P.

Biagioni, P.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Bjeneld, E.

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

Bonaccorso, F.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Bonnet, Ch.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Borggreen, J.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Borisov, A. G.

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

Borisov, A.G.

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

Börjesson, L.

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

Bosman, M.

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

Bozhevolnyi, S. I.

Broglia, R. A.

C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
[CrossRef]

Brongersma, M. L.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Broyer, M.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Bryant, G. W.

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

Cai, W.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Calogero, G.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Chang, W.-S.

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

Chaturvedi, N.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Chiappe, D.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Chilkoti, A.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Chowdhury, P.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Chulkov, E. V.

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

Ciracì, C.

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Cognet, L.

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

Coronado, E.

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

Cottancin, E.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Cronin, S. B.

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

Crozier, K.

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

Cuevas, J. C.

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

D’Andrea, C.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Danckwerts, M.

M. Danckwerts and L. Novotny, “Optical frequency mixing at coupled gold nanoparticles,” Phys. Rev. Lett. 98, 026104 (2007).
[CrossRef] [PubMed]

David, C.

C. David and F. J. García de Abajo, “Spatial nonlocality in the optical response of metal nanoparticles,” J. Phys. Chem. C 115, 19470–19475 (2011).
[CrossRef]

Davis, T. J.

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

de Mongeot, F. B.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Deutsch, B.

Dionne, J. A.

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

Dregely, D.

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

Duan, H.

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

Echenique, P. M.

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

Echternach, P. M.

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

Eisler, H.-J.

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

El-Khoury, P. Z.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Ellert, C.

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

El-Sayed, M. A.

P. K. Jain and M. A. El-Sayed, “Plasmonic coupling in noble metal nanostructures,” Chem. Phys. Lett. 487, 153–164 (2010).
[CrossRef]

C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
[CrossRef] [PubMed]

P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
[CrossRef]

P. K. Jain and M. A. El-Sayed, “Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model,” J. Phys. Chem. B 110, 18243–18253 (2006).
[CrossRef] [PubMed]

Elson, J. M.

K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
[CrossRef]

Emmerling, M.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Esteban, R.

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Fazio, B.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Feibelman, P. J.

P. J. Feibelman, “Surface electromagnetic fields,” Progress in Surface Science 12, 287–407 (1982).
[CrossRef]

Fernández-Domínguez, A. I.

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

Fritz, S.

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

Funston, A. M.

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

García de Abajo, F. J.

C. David and F. J. García de Abajo, “Spatial nonlocality in the optical response of metal nanoparticles,” J. Phys. Chem. C 115, 19470–19475 (2011).
[CrossRef]

R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
[CrossRef]

F. J. García de Abajo, “Nonlocal effects in the plasmons of strongly interacting nanoparticles, dimers, and waveguides,” J. Phys. Chem. C 112, 17983–17987 (2008).
[CrossRef]

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

Garcia-Etxarri, A.

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

García-Etxarri, A.

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

García-González, P.

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

García-Vidal, F. J.

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

Giessen, H.

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

González, M. U.

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

Grady, N. K.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Gray, S. K.

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
[CrossRef] [PubMed]

Grillet, N.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Gross, E. K. U.

M. A. L. Marques and E. K. U. Gross, “Time-dependent density functional theory,” Ann. Rev. of Phys. Chem. 55, 427–455 (2004).
[CrossRef]

Großmann, S.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Guarrottxena, N.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Gucciardi, P. G.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Gunnarson, O.

O. Gunnarson and B. I. Lundqvist, “Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism,” Phys. Rev. B 13, 4274–4298 (1976).
[CrossRef]

Gunnarsson, L.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

Haberland, H.

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

Häckel, T.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Halas, N. J.

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
[CrossRef]

Halterman, K.

K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
[CrossRef]

Hao, E.

E. Hao and G. C. Schatz, “Electromagnetic fields around silver nanoparticles and dimers,” J. Chem. Phys. 120, 357–366 (2004).
[CrossRef] [PubMed]

Hao, Q. Z.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Harel, E.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Hawkeye, M. M.

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

Hecht, B.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

Hentschel, M.

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

Hilger, A.

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

Hill, R. T.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Hillenbrand, R.

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

Hollars, C. W.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Hövel, H.

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

Huang, F. M.

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Huang, J.-S.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Huang, T. J.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Huang, W.

P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
[CrossRef]

Huber, A. J.

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

Hucknall, A.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

Hueser, F.

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

Huser, T. R.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Irrera, A.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Jackson, J. B.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Jain, P. K.

P. K. Jain and M. A. El-Sayed, “Plasmonic coupling in noble metal nanostructures,” Chem. Phys. Lett. 487, 153–164 (2010).
[CrossRef]

P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
[CrossRef]

P. K. Jain and M. A. El-Sayed, “Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model,” J. Phys. Chem. B 110, 18243–18253 (2006).
[CrossRef] [PubMed]

Jauho, A.-P.

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

Jensen, K. L.

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

Jensen, L.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Jin, J.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Jokerst, N. M.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

Juluri, B. K.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Jun, Y. C.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Käll, M.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

Kamp, M.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Kasemo, B.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

Kazansky, A. K.

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

Kebaïli, N.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Kelly, L.

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

Kempa, K.

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

Kern, J.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Kik, P. G.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Kim, S.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Kim, S.-W.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Kim, Y.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Kim, Y.-J.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Klein-Wiele, J.-H.

J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
[CrossRef]

Koel, B. E.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Koh, A. L.

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

Köller, L.

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

Kottmann, J. P.

J. P. Kottmann and O. J. F. Martin, “Plasmon resonant coupling in metallic nanowires,” Optics Express 8, 655–663 (2001).
[CrossRef] [PubMed]

J. P. Kottmann and O. J. F. Martin, “Retardation-induced plasmon resonances in coupled nanoparticles,” Optics Lett. 26, 1096–1098 (2001).
[CrossRef]

Kreibig, U.

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

Krenn, J. R.

Kreuzer, M. P.

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

Lal, S.

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

Lane, S. M.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Lee, T.-Ch.

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Lei, D. Y.

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

Leitner, A.

Lerme, J.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Lermé, J.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Liebsch, A.

A. Liebsch and W. L. Schaich, “Influence of a polarizable medium on the nonlocal optical response of a metal surface.” Phys. Rev. B 52, 14219–14234 (1995).
[CrossRef]

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

A. Liebsch, “Surface-plasmon dispersion and size dependence of Mie resonance: silver versus simple metals,” Phys. Rev. B 48, 11317–11328 (1993).
[CrossRef]

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

A. Liebsch, “Dynamical screening at simple-metal surfaces,” Phys. Rev. B 36, 7378–7388 (1987).
[CrossRef]

Link, S.

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

Liu, N.

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

Liz-Marzán, L. M.

R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
[CrossRef]

Ljungbert, Å.

P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
[CrossRef]

P. Apell and Å. Ljungbert, “Red shift of surface plasmons in small metal particles,” Solid State Commun. 44, 1367–1369 (1982).
[CrossRef]

Lounis, B.

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

Lu, M. Q.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Lundqvist, B. I.

O. Gunnarson and B. I. Lundqvist, “Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism,” Phys. Rev. B 13, 4274–4298 (1976).
[CrossRef]

Lundqvist, S.

P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
[CrossRef]

Lundsberg-Nielsen, L.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Luo, Y.

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

Lützenkirchen, K.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Mahajan, S.

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Maier, S. A.

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Marhaba, S.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Marinica, D. C.

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

Marques, M. A. L.

M. A. L. Marques and E. K. U. Gross, “Time-dependent density functional theory,” Ann. Rev. of Phys. Chem. 55, 427–455 (2004).
[CrossRef]

Martella, C.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Martin, O. J. F.

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

J. P. Kottmann and O. J. F. Martin, “Plasmon resonant coupling in metallic nanowires,” Optics Express 8, 655–663 (2001).
[CrossRef] [PubMed]

J. P. Kottmann and O. J. F. Martin, “Retardation-induced plasmon resonances in coupled nanoparticles,” Optics Lett. 26, 1096–1098 (2001).
[CrossRef]

McDonald, S. A.

J. H. Parks and S. A. McDonald, “Evolution of the collective-mode resonance in small adsorbed sodium clusters,” Phys. Rev. Lett. 62, 2301–2304 (1989).
[CrossRef] [PubMed]

McMahon, J. M.

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
[CrossRef] [PubMed]

Meiwes-Broer, K.-H.

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

Meltzer, S.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Mock, J. J.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Monreal, R. C.

R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
[CrossRef]

Mortensen, N. A.

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

Mühlschlegel, P.

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

Muller, R. E.

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

Mulvaney, P.

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

Nag, A.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Natelson, D.

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

Negro, L. D.

A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
[CrossRef] [PubMed]

Nielsen, M. B.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Nordlander, P.

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
[CrossRef]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
[CrossRef]

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
[CrossRef]

Novo, C.

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

Novotny, L.

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon. 1, 438–483 (2009).
[CrossRef]

M. Danckwerts and L. Novotny, “Optical frequency mixing at coupled gold nanoparticles,” Phys. Rev. Lett. 98, 026104 (2007).
[CrossRef] [PubMed]

Noy, G.

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

Nurmikko, A. V.

T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
[CrossRef]

Ofarim, A.

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

Oubre, C.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Palpant, B.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Park, H. S.

X. Ben and H. S. Park, “Size-dependent validity bounds on the universal plasmon ruler for metal nanostructure dimers,” J. Phys. Chem. C 116, 18944–18951 (2012).
[CrossRef]

Park, I.-Y.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Parks, J. H.

J. H. Parks and S. A. McDonald, “Evolution of the collective-mode resonance in small adsorbed sodium clusters,” Phys. Rev. Lett. 62, 2301–2304 (1989).
[CrossRef] [PubMed]

Pasquale, A. J.

A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
[CrossRef] [PubMed]

Pauly, F.

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

Pavaskar, P.

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

Pedersen, J.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Pellarin, M.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Pendry, J. B.

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

Penn, D. R.

P. Apell and D. R. Penn, “Optical properties of small metal spheres: surface effects,” Phys. Rev. Lett. 50, 1316–1319 (1983).
[CrossRef]

Perez, A.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Pérez-González, O.

O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
[CrossRef]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

Pitarke, J. M.

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

Plummer, E. W.

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

Pohl, D. W.

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

Prangsma, J. C.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Prével, B.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Prikulis, J.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

Prodan, E.

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
[CrossRef]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
[CrossRef]

Quidant, R.

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

Quinten, M.

Rasmussen, H. D.

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

Raza, S.

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

Reiners, T.

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

Reinhard, B. M.

A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
[CrossRef] [PubMed]

Requicha, A. A. G.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

Rindzevicius, T.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

Rodriguez-Perez, A.

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

Romero, I.

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

Rubahn, H.-G.

J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
[CrossRef]

Rubio, A.

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

L. Serra and A. Rubio, “Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory,” Phys. Rev. Lett. 78, 1428–1431 (1997).
[CrossRef]

Savage, K. J.

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

Schaich, W. L.

A. Liebsch and W. L. Schaich, “Influence of a polarizable medium on the nonlocal optical response of a metal surface.” Phys. Rev. B 52, 14219–14234 (1995).
[CrossRef]

Schatz, G. C.

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
[CrossRef] [PubMed]

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

E. Hao and G. C. Schatz, “Electromagnetic fields around silver nanoparticles and dimers,” J. Chem. Phys. 120, 357–366 (2004).
[CrossRef] [PubMed]

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

Scherman, O. A.

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Schmidt, M.

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

Schnell, M.

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

Scholl, J. A.

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

Schuller, J. A.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Segerink, F. B.

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

Selzer, Y.

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

Serra, L.

L. Serra and A. Rubio, “Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory,” Phys. Rev. Lett. 78, 1428–1431 (1997).
[CrossRef]

Silkin, V. M.

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

Simon, P.

J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
[CrossRef]

Singh, S.

K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
[CrossRef]

Smith, D. R.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Song, J.-H.

T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
[CrossRef]

Stefani, F. D.

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

Stella, L.

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

Tabor, C.

C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
[CrossRef] [PubMed]

Talley, C. E.

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

Tamarat, P.

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

Taminiau, T. H.

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

Tarakina, N. V.

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

Taylor, R. W.

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

Teperik, T. V.

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

Theiss, J.

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

Thygesen, K. S.

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

Tiggesbäumker, J.

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

Toma, A.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Toscano, G.

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

Treilleux, M.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Tsuei, K.-D.

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

Urzhumov, Y.

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

Van Haute, D.

C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
[CrossRef] [PubMed]

van Hulst, N. F.

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

Vasi, C.

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

Velegol, D.

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

Vialle, J. L.

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

Vialle, J.-L.

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

Vigezzi, E.

C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
[CrossRef]

Vogelgesang, R.

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

Vollmer, M.

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

Ward, D. R.

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

Weiss, T.

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

White, J. S.

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Wiener, A.

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

Wolter, S. D.

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

Wubs, M.

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, “Surface-enhanced Raman spectroscopy (SERS): nonlocal limitations,” Opt. Lett. 37, 2538–2540 (2012).
[CrossRef] [PubMed]

Xiao, S.

Xu, H.

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

Yang, J. K. W.

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

Yannouleas, C.

C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
[CrossRef]

Zabala, N.

O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
[CrossRef]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

Zhang, P.

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

Zhao, L. L.

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

Zou, S.

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

Zuolaga, J.

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
[CrossRef]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
[CrossRef]

ACS Nano (11)

A. J. Pasquale, B. M. Reinhard, and L. D. Negro, “Engineering photonic-plasmonic coupling in metal nanoparticle necklaces,” ACS Nano 5, 6578–6585 (2011).
[CrossRef] [PubMed]

B. Fazio, C. D’Andrea, F. Bonaccorso, A. Irrera, G. Calogero, C. Vasi, P. G. Gucciardi, M. Allegrini, A. Toma, D. Chiappe, C. Martella, and F. B. de Mongeot, “Re-radiation enhancement in polarized surface-enhanced resonant Raman scattering of randomly oriented molecules on self-organized gold nanowires,” ACS Nano 5, 5945–5956 (2011).
[CrossRef] [PubMed]

S. S. Aćimović, M. P. Kreuzer, M. U. González, and R. Quidant, “Plasmon near-field coupling in metal dimers as a step toward single-molecule sensing,” ACS Nano 3, 1231–1237 (2009).
[CrossRef] [PubMed]

B. K. Juluri, N. Chaturvedi, Q. Z. Hao, M. Q. Lu, D. Velegol, L. Jensen, and T. J. Huang, “Scalable manufacturing of plasmonic nanodisk dimers and cusp nanostructures using salting-out quenching method and colloidal lithography,” ACS Nano 5, 5838–5847 (2011).
[CrossRef] [PubMed]

R. T. Hill, J. J. Mock, A. Hucknall, S. D. Wolter, N. M. Jokerst, D. R. Smith, and A. Chilkoti, “Plasmon ruler with angstrom length resolution,” ACS Nano 6, 9237–9246 (2012).
[CrossRef] [PubMed]

R. W. Taylor, T.-Ch. Lee, O. A. Scherman, R. Esteban, J. Aizpurua, F. M. Huang, J. J. Baumberg, and S. Mahajan, “Precise subnanometer plasmonic junctions for SERS within gold nanoparticle assemblies using cucurbit[n]uril ”glue”,” ACS Nano 5, 3878–3887 (2011).
[CrossRef] [PubMed]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum plasmonics: optical properties and tunability of metallic nanorods,” ACS Nano 4, 5269–5276 (2010).
[CrossRef]

M. Hentschel, D. Dregely, R. Vogelgesang, H. Giessen, and N. Liu, “Plasmonic oligomers: the role of individual particles in collective behavior,” ACS Nano 5, 2042–2050 (2011).
[CrossRef] [PubMed]

M. Banik, P. Z. El-Khoury, A. Nag, A. Rodriguez-Perez, N. Guarrottxena, G. C. Bazan, and V. A. Apkarian, “Surface-enhanced Raman trajectories on a nano-dumbbell: transition from field to charge transfer plasmons as the spheres fuse,” ACS Nano 6, 10343–10354 (2012).
[CrossRef] [PubMed]

C. Tabor, D. Van Haute, and M. A. El-Sayed, “Effect of Orientation on plasmonic coupling between gold nanorods,” ACS Nano 3, 3670–3678 (2009).
[CrossRef] [PubMed]

D. Y. Lei, A. Aubry, Y. Luo, S. A. Maier, and J. B. Pendry, “Plasmon interaction between overlapping nanowires,” ACS Nano 5, 597–607 (2011).
[CrossRef]

Adv. Opt. Photon. (1)

Ann. Rev. of Phys. Chem. (1)

M. A. L. Marques and E. K. U. Gross, “Time-dependent density functional theory,” Ann. Rev. of Phys. Chem. 55, 427–455 (2004).
[CrossRef]

Chem. Phys. Lett. (2)

P. K. Jain and M. A. El-Sayed, “Plasmonic coupling in noble metal nanostructures,” Chem. Phys. Lett. 487, 153–164 (2010).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Effects of dielectric screening on the optical properties of metallic nanoshells,” Chem. Phys. Lett. 368, 94–101 (2003).
[CrossRef]

Chem. Rev. (1)

N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, “Plasmons in strongly coupled metallic nanostructures,” Chem. Rev. 111, 3913–3961 (2011).
[CrossRef] [PubMed]

J. Chem. Phys. (1)

E. Hao and G. C. Schatz, “Electromagnetic fields around silver nanoparticles and dimers,” J. Chem. Phys. 120, 357–366 (2004).
[CrossRef] [PubMed]

J. Phys. Chem. B (3)

P. K. Jain and M. A. El-Sayed, “Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model,” J. Phys. Chem. B 110, 18243–18253 (2006).
[CrossRef] [PubMed]

L. Gunnarsson, T. Rindzevicius, J. Prikulis, B. Kasemo, M. Käll, S. Zou, and G. C. Schatz, “Confined plasmons in nanofabricated single silver particle pairs: experimental observations of strong interparticle interactions,” J. Phys. Chem. B 109, 1079–1087 (2005).
[CrossRef]

L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, “The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment,” J. Phys. Chem. B 107, 668–667 (2003).
[CrossRef]

J. Phys. Chem. C (5)

L. Stella, P. Zhang, F. J. García-Vidal, A. Rubio, and P. García-González, “Performance of nonlocal optics when applied to plasmonic nanostructures,” J. Phys. Chem. C 117, 8941–8949 (2013).
[CrossRef]

X. Ben and H. S. Park, “Size-dependent validity bounds on the universal plasmon ruler for metal nanostructure dimers,” J. Phys. Chem. C 116, 18944–18951 (2012).
[CrossRef]

S. Marhaba, G. Bachelier, Ch. Bonnet, M. Broyer, E. Cottancin, N. Grillet, J. Lerme, J.-L. Vialle, and M. Pellarin, “Surface plasmon resonance of single gold nanodimers near the conductive contact limit,” J. Phys. Chem. C 113, 4349–4356 (2009).
[CrossRef]

F. J. García de Abajo, “Nonlocal effects in the plasmons of strongly interacting nanoparticles, dimers, and waveguides,” J. Phys. Chem. C 112, 17983–17987 (2008).
[CrossRef]

C. David and F. J. García de Abajo, “Spatial nonlocality in the optical response of metal nanoparticles,” J. Phys. Chem. C 115, 19470–19475 (2011).
[CrossRef]

J. Phys. Chem. Lett. (1)

R. Alvarez-Puebla, L. M. Liz-Marzán, and F. J. García de Abajo, “Light concentration at the nanometer scale,” J. Phys. Chem. Lett. 1, 2428–2434 (2010).
[CrossRef]

Nano Lett. (15)

C. E. Talley, J. B. Jackson, C. Oubre, N. K. Grady, C. W. Hollars, S. M. Lane, T. R. Huser, P. Nordlander, and N. J. Halas, “Surface-enhanced Raman scattering from individual Au nanoparticles and nanoparticle dimer substrates,” Nano Lett. 5, 1569–1574 (2005).
[CrossRef] [PubMed]

J. Theiss, P. Pavaskar, P. M. Echternach, R. E. Muller, and S. B. Cronin, “Plasmonic nanoparticle arrays with nanometer separation for high-performance SERS substrates,” Nano Lett. 10, 2749–2754 (2010).
[CrossRef] [PubMed]

P. K. Jain, W. Huang, and M. A. El-Sayed, “On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation,” Nano Lett. 7, 2080–2088 (2007).
[CrossRef]

R. Arielly, A. Ofarim, G. Noy, and Y. Selzer, “Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies,” Nano Lett. 11, 2968–2972 (2011).
[CrossRef] [PubMed]

J. Kern, S. Großmann, N. V. Tarakina, T. Häckel, M. Emmerling, M. Kamp, J.-S. Huang, P. Biagioni, J. C. Prangsma, and B. Hecht, “Atomic-scale confinement of resonant optical fields,” Nano Lett. 12, 5504–5509 (2012).
[CrossRef] [PubMed]

H. Duan, A. I. Fernández-Domínguez, M. Bosman, S. A. Maier, and J. K. W. Yang, “Nanoplasmonics: classical down to the nanometer scale,” Nano Lett. 12, 1683–1689 (2012).
[CrossRef] [PubMed]

J. A. Scholl, A. García-Etxarri, A. L. Koh, and J. A. Dionne, “Observation of quantum tunneling between two plasmonic nanoparticles,” Nano Lett. 13, 564–569 (2013).
[CrossRef]

J. Zuolaga, E. Prodan, and P. Nordlander, “Quantum description of the plasmon resonances of a nanoparticle dimer,” Nano Lett. 9, 887–891 (2009).
[CrossRef]

D. C. Marinica, A. K. Kazansky, P. Nordlander, J. Aizpurua, and A. G. Borisov, “Quantum plasmonics: nonlinear effects in the field enhancement of a plasmonic nanoparticle dimer,” Nano Lett. 12, 1333–1339 (2012).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Optical properties of nanowire dimers with a spatially nonlocal dielectric function,” Nano Lett. 10, 3473–3481 (2010).
[CrossRef] [PubMed]

O. Pérez-González, N. Zabala, A. G. Borisov, N. J. Halas, P. Nordlander, and J. Aizpurua, “Optical spectroscopy of conductive junctions in plasmonic cavities,” Nano Lett. 10, 3090–3095 (2010).
[CrossRef] [PubMed]

A. M. Funston, C. Novo, T. J. Davis, and P. Mulvaney, “Plasmon coupling of gold nanorods at short distances and in different geometries,” Nano Lett. 9, 1651–1658 (2009).
[CrossRef] [PubMed]

S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, “Observation of intrinsic size effects in the optical response of individual gold nanoparticles,” Nano Lett. 5, 515–518 (2005).
[CrossRef] [PubMed]

T. Atay, J.-H. Song, and A. V. Nurmikko, “Strongly interacting plasmon nanoparticle pairs: from dipole-dipole interaction to conductively coupled regime,” Nano Lett. 4, 1627–1631 (2004).
[CrossRef]

E. Prodan, P. Nordlander, and N. J. Halas, “Electronic structure and optical properties of Gold nanoshells,” Nano Lett. 3, 1411–1415 (2003).
[CrossRef]

Nature (2)

K. J. Savage, M. M. Hawkeye, R. Esteban, A. G. Borisov, J. Aizpurua, and J. J. Baumberg, “Revealing the quantum regime in tunnelling plasmonics,” Nature 491, 574–577 (2012).
[CrossRef] [PubMed]

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field enhancement,” Nature 453, 757–760 (2008).
[CrossRef] [PubMed]

Nature Commun. (1)

R. Esteban, A. G. Borisov, P. Nordlander, and J. Aizpurua, “Bridging quantum and classical plasmonics with a quantum-corrected model,” Nature Commun. 3, 825 (2012).
[CrossRef]

Nature Materials (2)

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, “Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides,” Nature Materials 2, 229–232 (2003).
[CrossRef] [PubMed]

J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, “Plasmonics for extreme light concentration and manipulation,” Nature Materials 9, 193–204 (2010).
[CrossRef] [PubMed]

Nature Nanotechnology (1)

D. R. Ward, F. Hueser, F. Pauly, J. C. Cuevas, and D. Natelson, “Optical rectification and field enhancement in a plasmonic nanogap,” Nature Nanotechnology 5, 732–736 (2010).
[CrossRef] [PubMed]

Nature Photonics (2)

T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, “Optical antennas direct single-molecule emission,” Nature Photonics 2, 234–237 (2008).
[CrossRef]

M. Schnell, A. Garcia-Etxarri, A. J. Huber, K. Crozier, J. Aizpurua, and R. Hillenbrand, “Controlling the near-field oscillations of loaded plasmonic nanoantennas,” Nature Photonics 3, 287–291 (2009).
[CrossRef]

New J. Phys. (2)

O. Pérez-González, N. Zabala, and J. Aizpurua, “Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps,” New J. Phys. 13, 083013 (2011).
[CrossRef]

R. C. Monreal, T. J. Antosiewicz, and P. Apell, “Competition between surface screening and size quantization for surface plasmons in nanoparticles,” New J. Phys. 15, 083044 (2013).
[CrossRef]

Opt. Lett. (2)

Optics Express (3)

G. Toscano, S. Raza, A.-P. Jauho, N. A. Mortensen, and M. Wubs, “Modified field enhancement and extinction by plasmonic nanowire dimers due to nonlocal response,” Optics Express 20, 4176–4188 (2012).
[CrossRef] [PubMed]

I. Romero, J. Aizpurua, G. W. Bryant, and F. J. García de Abajo, “Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers,” Optics Express 14, 9988–9999 (2006).
[CrossRef] [PubMed]

J. P. Kottmann and O. J. F. Martin, “Plasmon resonant coupling in metallic nanowires,” Optics Express 8, 655–663 (2001).
[CrossRef] [PubMed]

Optics Lett. (1)

J. P. Kottmann and O. J. F. Martin, “Retardation-induced plasmon resonances in coupled nanoparticles,” Optics Lett. 26, 1096–1098 (2001).
[CrossRef]

Phys. Rev. A (1)

J. Tiggesbäumker, L. Köller, K.-H. Meiwes-Broer, and A. Liebsch, “Blue shift of the Mie plasma frequency in Ag clusters and particles,” Phys. Rev. A 48, R1749–R1752 (1993).
[CrossRef] [PubMed]

Phys. Rev. B (11)

A. Liebsch and W. L. Schaich, “Influence of a polarizable medium on the nonlocal optical response of a metal surface.” Phys. Rev. B 52, 14219–14234 (1995).
[CrossRef]

A. Liebsch, “Dynamical screening at simple-metal surfaces,” Phys. Rev. B 36, 7378–7388 (1987).
[CrossRef]

A. J. Bennett, “Influence of the electron charge distribution on surface-plasmon dispersion,” Phys. Rev. B 1, 203–207 (1970).
[CrossRef]

K. Halterman, J. M. Elson, and S. Singh, “Plasmonic resonances and electromagnetic forces between coupled silver nanowires,” Phys. Rev. B 72, 075429 (2005).
[CrossRef]

C. Yannouleas, E. Vigezzi, and R. A. Broglia, “Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description,” Phys. Rev. B 47, 9849–9861 (1993).
[CrossRef]

O. Gunnarson and B. I. Lundqvist, “Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism,” Phys. Rev. B 13, 4274–4298 (1976).
[CrossRef]

H. Hövel, S. Fritz, A. Hilger, U. Kreibig, and M. Vollmer, “Width of cluster plasmon resonances: bulk dielectric functions and chemical interface damping,” Phys. Rev. B 48, 18178–18188 (1993).
[CrossRef]

J. Borggreen, P. Chowdhury, N. Kebaïli, L. Lundsberg-Nielsen, K. Lützenkirchen, M. B. Nielsen, J. Pedersen, and H. D. Rasmussen, “Plasma excitations in charged sodium clusters,” Phys. Rev. B 48, 17507–17516 (1993).
[CrossRef]

A. Liebsch, “Surface-plasmon dispersion and size dependence of Mie resonance: silver versus simple metals,” Phys. Rev. B 48, 11317–11328 (1993).
[CrossRef]

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry, “Transformation-optics insight into nonlocal effects in separated nanowires,” Phys. Rev. B 86,241110(R) (2012).
[CrossRef]

K. Andersen, K. L. Jensen, N. A. Mortensen, and K. S. Thygesen, “Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime,” Phys. Rev. B 87, 235433 (2013).
[CrossRef]

Phys. Rev. Lett. (12)

T. V. Teperik, P. Nordlander, J. Aizpurua, and A.G. Borisov, “Robust subnanometric plasmon ruler by rescaling of the nonlocal optical response,” Phys. Rev. Lett. 110, 263901 (2013).
[CrossRef] [PubMed]

M. Danckwerts and L. Novotny, “Optical frequency mixing at coupled gold nanoparticles,” Phys. Rev. Lett. 98, 026104 (2007).
[CrossRef] [PubMed]

H. Xu, E. Bjeneld, M. Käll, and L. Börjesson, “Spectroscopy of single hemoglobin molecules by surface enhanced Raman scattering,” Phys. Rev. Lett. 83, 4357–4360 (1999).
[CrossRef]

A. I. Fernández-Domínguez, A. Wiener, F. J. García-Vidal, S. A. Maier, and J. B. Pendry, “Transformation-optics description of nonlocal effects in plasmonic nanostructures,” Phys. Rev. Lett. 108, 106802 (2012).
[CrossRef] [PubMed]

J. M. McMahon, S. K. Gray, and G. C. Schatz, “Nonlocal optical response of metal nanostructures with arbitrary shape,” Phys. Rev. Lett. 103, 097403 (2009).
[CrossRef] [PubMed]

T. Reiners, C. Ellert, M. Schmidt, and H. Haberland, “Size dependence of the optical response of spherical sodium clusters,” Phys. Rev. Lett. 74, 1558–1561 (1995).
[CrossRef] [PubMed]

P. Apell and D. R. Penn, “Optical properties of small metal spheres: surface effects,” Phys. Rev. Lett. 50, 1316–1319 (1983).
[CrossRef]

J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, “Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters,” Phys. Rev. Lett. 80, 45–48 (1998).
[CrossRef]

J. H. Parks and S. A. McDonald, “Evolution of the collective-mode resonance in small adsorbed sodium clusters,” Phys. Rev. Lett. 62, 2301–2304 (1989).
[CrossRef] [PubMed]

K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, “Multipole plasmon modes at a metal surface,” Phys. Rev. Lett. 64, 44–47 (1990).
[CrossRef] [PubMed]

J. Lermé, B. Palpant, B. Prével, M. Pellarin, M. Treilleux, J. L. Vialle, A. Perez, and M. Broyer, “Quenching of the size effects in free and matrix-embedded silver clusters,” Phys. Rev. Lett. 80, 5105–5108 (1998).
[CrossRef]

L. Serra and A. Rubio, “Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory,” Phys. Rev. Lett. 78, 1428–1431 (1997).
[CrossRef]

Physica Scripta (1)

P. Apell, Å. Ljungbert, and S. Lundqvist, “Non-local effects at metal surfaces,” Physica Scripta 30, 367–383 (1984).
[CrossRef]

Progress in Surface Science (1)

P. J. Feibelman, “Surface electromagnetic fields,” Progress in Surface Science 12, 287–407 (1982).
[CrossRef]

Rep. Prog. Phys. (1)

J. M. Pitarke, V. M. Silkin, E. V. Chulkov, and P. M. Echenique, “Theory of surface plasmons and surface-plasmon polaritons,” Rep. Prog. Phys. 70, 1–87 (2007).
[CrossRef]

Science (3)

C. Ciracì, R. T. Hill, J. J. Mock, Y. Urzhumov, A. I. Fernández-Domínguez, S. A. Maier, J. B. Pendry, A. Chilkoti, and D. R. Smith, “Probing the ultimate limits of plasmonic enhancement,” Science 337, 1072–1074 (2012).
[CrossRef] [PubMed]

P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, “Resonant optical antennas,” Science 308, 1607–1609 (2005).
[CrossRef] [PubMed]

N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, “Three-dimensional plasmon rulers,” Science 332, 1407–1410 (2011).
[CrossRef] [PubMed]

Solid State Commun. (1)

P. Apell and Å. Ljungbert, “Red shift of surface plasmons in small metal particles,” Solid State Commun. 44, 1367–1369 (1982).
[CrossRef]

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (7)

Fig. 1
Fig. 1

Sketch of the geometry of the nanowire dimer. Two identical cylindrical nanowires are infinite along the z-axis and have a diameter D of the circular cross-section in the (x, y)-plane. The nanowires are separated by a junction of separation width S. The incident radiation is linearly polarised with the electric field along the x-axis.

Fig. 2
Fig. 2

Extinction coefficient for the single jellium nanowire of diameter D = 6.2 nm (left) and D = 9.8 nm (right). Results are shown as function of the frequency ω of the incident radiation. The incoming field is the x-polarised plane wave. The TDDFT calculations are compared with results of the classical electromagnetic calculations using local (Drude) and NLHD. See the legend for definition of the different symbols used in the Fig.

Fig. 3
Fig. 3

Waterfall plot of the extinction cross section per length for a nanowire dimer in vacuum. The dimer consists of two Na nanowires of diameter D = 6.2 nm (left) and D = 9.8 nm (right) separated by a junction of variable width S. The incoming field is an x-polarised plane wave. The centers of the wires are at x = ±(D + S)/2), and S is negative for overlapping cylinders. S = −D would correspond to the limit of a single cylinder. TDDFT results are given as function of the frequency ω of the incident radiation for different separations S between the nanowires. For clarity a vertical shift proportional to the separation distance is introduced for each absorption spectrum. The red curves are used each 5 a0 ≈ 2.65 Å of S-change. These are labeled with corresponding S-values each 10 a0 ≈ 5.3 Å of S-change. The plasmonic modes responsible for the peaks in the absorption cross-section are labelled. These are: Bonding Dipole Plasmon (DP), Bonding Quadrupole Plasmon (QP), high order hybridised mode close to ωsp (HM), the lowest (dipole) Charge Transfer Plasmon (C1), and the higher energy Charge Transfer Plasmon (C2). On the right panel the blue dotted curve at S = 26.5 Å shows results of the classical Drude calculation with adjusted parameters and the green dotted curve represents results of the NLHD model. Further details are give in the main text.

Fig. 4
Fig. 4

Panels (a)–(k) Detailed analysis of the plasmon dynamics in the D = 9.8 nm nanowire dimer system. The incident x-polarised laser pulse is at resonance with the lowest (DP at S > 0 or C1 at S ≤ 0) plasmon mode. Panels (a)–(j) present snapshots of the induced charge density Δn, current density Jx, and electric field Ex for different junction widths S as indicated to the left of each row. The induced currents and fields are measured along the interparticle x-axis. Positive (negative) values correspond to the red (blue) color code. The induced densities are shown at the instant of time corresponding to the maximum dipole moment of the dimer. The induced currents and fields are shown at the instants of time when the induced fields in the junction reach the maximum. Panel (k): Conductivity analysis. The current Jx measured on the x-axis in the middle of the junction is plotted as a function of the normalized electric field at the same position. Different colors correspond to different junction widths S as labeled in the insert.

Fig. 5
Fig. 5

Extinction cross section per length of a nanowire dimer as obtained with the full TDDFT calculations, with the quantum corrected model (QCM), with classical Drude electromagnetic calculations (Drude), and with calculations based on the nonlocal hydrodynamic model (NLHD). The dimer consists of two D = 9.8 nm Na nanowires in vacuum. The incoming plane wave is polarized along the dimer axis x. Upper panels: Waterfall plots of the dipole absorption cross-section as a function of the width of the junction S. Red curves correspond to S = −5.3 Å, −2.65 Å, 0 Å, 2.65 Å, 5.3 Å, 7.95 Å, and 10.6 Å. For further details see the caption of Fig. 3. Lower panels: Color plots of the local field enhancement at the center of the junction for positive separations. Results are shown as a function of the frequency ω of the incident radiation and junction width S. The color code is displayed at the bottom of the corresponding panels. In the Drude case, because of the divergence of the fields, the color scale has been saturated (enhancement > 200) for junction widths below 1.25 Å.

Fig. 6
Fig. 6

Detailed comparison between TDDFT and QCM calculations. The extinction cross-section per length of the D = 9.8 nm Na nanowire dimer is shown for small separations S. This S-range corresponds to the strong tunneling regime and the transition from separated to conductively coupled nanowires. The frequency range is zoomed at the transition from the bonding dipole (DP) to the lowest charge transfer (C1) plasmon. Waterfall plots of the optical absorption cross-section are shown for the junction widths changing from S = −2.65 Å (lowest blue line) to S = 4.77 Å (upper black line) in steps of 1 a0 (0.53 Å). For further details see the caption of Fig. 3.

Fig. 7
Fig. 7

Dynamic screening. (a) Time evolution of the density Δn induced by the ω = 3.16 eV laser pulse at the surface of the left cylinder facing the S = 13.25 Å wide junction. The data is shown as a function of the x-coordinate along the dimer axis for the D = 9.8 nm dimer. x = 0 corresponds to the center of the junction. Different curves correspond to instants of time spanning 1/2 optical period starting from t0. For further details see the text. (b) Schematic representation of the location of the plasmon induced screening charges in the junction. Within the local classical approach the screening charges are at the geometrical surfaces of the cylinders (here equivalent to the jellium edges) separated by the junction of width S. Within the TDDFT, the centroids of the screening charges (red areas) are located at Re[d(ω)] in front of the jellium edges so that the effective separation is S −2Re[d(ω)]. In the NLHD approach the centroids of the screening charges (blue areas) are located at a distance δ below the geometrical surface so that the effective separation is S + 2δ. (c) Energy of the dipole plasmon resonance as function of the junction width S. Dots: TDDFT results obtained for the D = 9.8 nm nanowire dimer. Dashed red (gray) lines show results of classical Drude (NLHD) calculations where the separation S is measured between the jellium edges. The solid red line shows the results of the classical Drude calculations performed for an effective separation S − 2Re[d(ω)]. The dotted gray line shows the results of the NLHD calculations performed for an effective separation S − 2Re[d(ω)] − 2δ. (d) Energy of the dipole plasmon resonance as function of the junction width S. Dots: TDDFT results obtained for nanowire dimers formed by D = 6.2 nm and D = 9.8 nm nanowires (see the legend). Solid and dashed lines show results of classical Drude calculations for D = 6.2 nm (blue) and D = 9.8 nm (red) dimers. Dashed lines: calculations performed for the junction width S measured between the jellium edges. Solid lines: calculations performed for a corrected effective separation S − 2Re[d(ω)].

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

i Ψ j ( x , y , t ) t = ( Δ 2 m + V eff ( x , y , t ; [ n ] ) ) Ψ j ( x , y , t ) ,
n ( x , y , t ) = 2 j occ . χ j | Ψ j ( x , y , t ) | 2 .
χ j = 1 π 2 ( E F E j ) ,
ε ( ω ) = 1 ω p 2 ω ( ω + i γ ) ,
ε L ( ω ) = 1 ω p 2 ω ( ω + i γ ) β 2 k 2 .
ε eff ( x , y , S , ω ) = 1 ω p 2 ω ( ω + i γ eff ( x , y , S ) ) .
ω res / ω sp = 1 Re [ d ( ω sp ) ] / R cl + O ( R cl 2 ) .

Metrics