Abstract

Two-dimensional metallic broadband absorbers on a SiO2/Ag/Si substrate were experimentally studied. The absorptivity of such structure can be increased by tailoring the ratio of disk size to the unit cell area. The metallic disk exhibits a localized surface plasmon polariton (LSPP) mode for both TE and TM polarizations. A broadband thermal emitter can be realized because the LSPP mode is independent of the periodicities. By manipulating the ratios and disk sizes, a high-performance, wide-angle, polarization-independent dual band absorber was experimentally achieved. The results demonstrated a substantial flexibility in absorber designs for applications in thermal photovoltaics, sensors, and camouflage.

© 2012 OSA

1. Introduction

Localized surface plasmon polaritons (LSPPs) are electromagnetic excitations localized at the metal/dielectric interface with a strong field enhancement and a decay of evanescent wave intensity away from the boundary. One of the important applications of LSPPs is in plasmonic absorbers with a large absorption from the field enhancement near the interface. The absorbers have recently attracted considerable interest in the research for applications such as solar cells [13], sensors [412], filters [13, 14], and metamaterial coatings [15]. Based on Kirchhoff’s law of thermal radiation [16], such absorbers operating in the mid-infrared regime can be used as thermal emitters. The emitters are crucial to several relevant applications, especially in thermal selective mid-infrared (MIR) sources [1720] and thermalphotovoltaic (TPV) converters [21, 22]. The resonance condition of absorbers sensitively depends on the sizes and geometries. The optical properties of the geometric shapes have been explored, such as strips [4, 18, 23], disks [5, 17, 20, 23, 24] rings [6], split rings [7, 8, 25] crosses [9, 19] crescents [10] and rods [11, 12]. However, most of high-performance absorbers do not have large incident angle tolerance, such as H-shaped [15] and U-shaped structures [25]. In this study, a round-shaped metal disk absorber is applied because it can provide an angle and polarization independent LSPP band over a broad range of incidence angles of up to nearly 90° [5, 20]. The experimental results and numerical simulations performed by using rigorous coupled-wave analysis (RCWA) clearly revealed that the resonant wavelength of the LSPP band is independent of the disk periodicity. Since its highly localized behavior, we also combined six distinct disks in one unit cell to form a broadband absorber with a bandwidth of 2000 nm operating at MIR wavelengths, which can potentially be used as a broadband thermal emitter. We also first experimentally found that the absorptivity of the round-shaped disk absorber obeying the Beer Lambert law can be enhanced by increasing the ratio of disk size to the unit cell area. By modifying the area filling ratio, we can demonstrate a high-performance, wide-angle, polarization-independent dual band absorber with two maximal absorptivity peaks greater than 84% over a wide range of incident angles.

2. Design and simulation

Figure 1(a) illustrates the geometry of the metallic disk (MD) array structure. An array (with period Λ) of MDs with diameter D and thickness tAg is deposited on the top and a silver ground plane is on the bottom separated by a thin SiO2 layer with a thickness tSiO2. The bottom layer acts as a mirror to reflect incident light and block light transmittance. The fabrication of the structure began with e-gun deposition of a 5nm Cr adhesion layer and a 100 nm sliver layer on the top of a silicon (Si) substrate, followed by a thickness of SiO2 thin film deposited by plasma-enhanced chemical vapor deposition (PECVD). A polymethyl methacrylate (PMMA) layer as an e-beam resist was then spin-coated on the top of the SiO2 thin-film layer. An array of the round-shaped disks periodically spaced with a lattice constant Λ in x and y directions was defined on the PMMA resist by electron beam lithography (EBL). After developing the resist, a 100-nm-thick sliver layer was deposited. Then, a PMMA lift-off process was carried out by rinsing the sample in acetone for a few minutes and cleaning it with isopropyl alcohol and de-ionized water, respectively. Finally, the completed structure was dried with nitrogen gas. The size of the array structure was 200μm × 200μm. Figure 1(b) shows a scanning electron microscopy (SEM) image of a fabricated specimen with the dimensions of Λ = 1.5 μm, D = 1 μm, tAg = 100 nm, and tSiO2 = 80 nm. To understand the resonant behavior of the structure, its reflectance spectra and resonant mode profiles were simulated by RCWA algorithm [26], where the frequency-dependent complex dielectric constants of silver (Ag) and SiO2 were obtained from [27].

 

Fig. 1 (a) Schematic diagram of the investigated MD structure. (b) SEM image of a fabricated MD structure. The inset shows the details of the structure within one unit cell at a 35° angle of view.

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Figures 2(a) and 2(b) show the TM and TE polarized reflectance spectra of the structure with photon energy ranging from 0.12 eV to 0.64 eV, and the angle of incidence θi varying from 0° to 90°. As shown in both TM and TE polarized reflectance spectra, a clear angle-independent resonance absorption band occurs at 0.35 eV, corresponding to a LSPP mode. The mode is caused by a strong coupling between the surface plasmon polariton (SPP) modes of the top MD and bottom silver layers. This strong coupling forms a Fabry–Pérot-like resonance in the SiO2 cavity as shown in our previous study (see Fig. 2(c) and 2(d) of [20].). According to calculated mode profiles, 72% of |Hy|2 is localized in the SiO2 layer, and only 28% of |Hy|2 is distributed within the metal region. Because the |Hy|2 distributions are mostly localized within the SiO2 cavity and less coupling occurred between neighboring MDs, the resonant wavelength is independent of its periodicity; however it is sensitive to individual MD size and the effective index of the medium in the cavity. When the SiO2 spacer thickness is decreased, the light becomes more concentrated in the resonant cavity and is red-shifted due to increase of the effective index of the mode in the resonant cavity [28]. The RCWA simulation results in the study were also verified by applying 3-D finite-element method (FEM) for the same structure.

 

Fig. 2 (a) TM- and (b) TE- mode stimulated reflectance spectra of the MD structure with D = 1 μm, Λ = 1.5 μm, tAg = 100 nm, and tSiO2 = 80 nm.

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Because the resonance is immune to the MD period, it is feasible for applications in broadband emitters and absorbers consisting of various sublattices with various MD resonators corresponding to various absorption bands. According to Kirchhoff’s law of thermal radiation, the emittance normalized by the blackbody emittance must be equal to absorptivity at equilibrium. The equality has been demonstrated and reported [19]. If no transmission occurs, the thermal emission spectrum can be predicted by the product of the blackbody radiation profile and the absorptivity integrated over a solid angle

Emission(λ,T)=B(λ,T)(1R(λ,θ,ϕ))cosθdΩ
where B(λ,T) denotes the thermal radiation spectrum of a perfect blackbody (with unit W/m2) at temperature T, and 1R(λ,θ,φ) is the absorptivity of the designed sample. Therefore, through the equation, the thermal emission peaks of the sample can be enhanced by the increased absorptivity at specified resonant wavelengths and temperature. The absorptivity or absorbance is particularly governed by an absorbing species of cross-sectional area and species concentration, which is the well-known Beer Lambert law [29]. The absorptivity or emissivity of the absorber can be improved by modifying the absorption cross section and concentration.

3. Experimental results and discussion

To characterize the resonant mode and absorptivity A(λ) = 1 - R(λ) of the structure, the reflectivities R(λ) at normal incidence normalized with respect to a bare Ag/Si substrate were measured by using a Fourier transform infrared (FTIR) spectrometer. We also confirmed that the measured absorptivities of the absorbers are nearly the same by using an Ag/Si layer or an Au standard, and the difference between absorptivities from two substrates is less than 3%. A MIR unpolarized light source was focused the sample and reflected back. The back-reflected light through a 50μm × 50μm slit was collected and detected using a MCT (mercury-cadmium-telluride) photodetector with a spectral resolution of 2 cm−1. Figure 3(a) shows the measured resonant wavelengths of the SiO2 cavities with varying disk sizes when tSiO2 = 80 nm and Λ = 1.5 μm. The resonant wavelength is linearly proportional to the MD size (black open squares), in accordance with our simulation (blue solid line). The wavelength tuning rate is approximately 2.8 nm per nm change in D. The absorptivities of the MD arrays versus density and size were also examined. Figure 3(b) displays the absorptivities of the 1 μm MD absorbers with Λ = 1.5, 2, 2.5, 3, 4, and 6 μm. All of the absorption peaks were observed at 3.63 μm, showing an agreement with our simulation in Fig. 2(a) and 2(b). The peak absorptivity with approximately the same FWHM of 0.28 μm increased from 17% to 94% as we diminished the periodicity of the MD array (i.e., an increase in the MD density). The figure of merit (FOM) of the absorber defined as FOM = AQ [30], where A and Q = λ/Δλ are absorptivity and quality factor. The FOM of the metal disk array can be increase from 2.2 to 12 by reducing the periodicity from 6 μm to 1.5 μm. Figure 3(c) shows the absorptivities of the absorbers versus the considered disk sizes D (ranging from 846 nm to 1.88 μm), when Λ = 3 μm. The absorption peaks for D = 846 nm, 1.06 μm, 1.57 μm, 1.36 μm, 1.65 μm, and 1.88 μm were found at λ = 2.96, 3.67, 4.05, 4.65, 5.36, and 5.91 μm with a maximal absorptivity of 47%, 66%, 75%, 85%, 90%, and 95%, respectively. Other high-order modes for D = 1.65 μm and 1.88 μm at λ = 3.40 μm and 3.81 μm, corresponding to CO2 and water vapor absorption features in the atmosphere were also visible. When the disk size was increased in proportion to its absorption cross-section, the energy absorbed per unit area due to the Fabry–Pérot-like resonance in the MD resonator increased, resulting in a pronounced increase in the absorptivity. Because the MD density and size are associated with the area-fill factor (F), defined as the ratio of MD size to the unit cell area, the dependence of the absorptivity on the fill factor is shown in Fig. 3(d). The absorptivity is linearly proportional to the fill factor when F< 0.24, and it becomes saturated over 90% of absorption when F≧0.24. Therefore, the result that behaves similarly to the Beer Lambert law when F< 0.24 allows us to control the absorption of the MD configuration.

 

Fig. 3 (a) Comparison of the calculated and measured wavelengths of resonances as functions of the disk diameter D. (b) Absorptivities at normal incidence of the 1 μm MD arrays with several different periodicities Λ. (c) Absorptivities of the MD arrays with different diameters D for Λ fixed at 3 μm. (d) Experimental peak absorptivity of the MD configuration as a function of its area-fill factor F.

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With these absorption properties, we present experimental demonstrations of a broadband emitter and a high-performance dual-band absorber. Figure 4(a) shows the absorptivity of the broadband thermal emitter composed of the sublattices with six different disks from 800 nm to 1.35 μm, where the distance between the nearest-neighbor disks is maintained at 1.5 μm. The absorbing spectrum is evidently broad because of the merging of six close peaks located closely to the resonant peaks for each of the single-sized MD absorbers. Although the broadband emitter has a low absorptivity of approximately 35% with a FWHM of 2000 nm centered at the wavelength 4.32 μm, high thermal emittance peaks of the emitter can be achieved by easily increasing heating temperature to modify the thermal dependence of the blackbody emittance curve B(λ,T) as demonstrated in the related literatures [19, 20] without changing emissivity. The purpose the demonstration in Fig. 4(a) is to illustrate that the metal disk array can function as a narrow or broadband absorber as required. Multi-sized disks within one unit cell and large area-fill factors for each of the disks are essential to obtain a broadband absorber with higher absorptivity. However, if all of the disks are patterned on the same layer, a design trade-off occurs between the multi-sized disks and fill factors corresponding to a number of absorption bands and absorption intensities. Despite the trade-off, a high performance angle and polarization independent dual-band absorber can be realized. Figure 4(b) shows the absorptivity of the dual-band absorber with a SiO2 spacer of 80 nm where the incident angle varies from 0° and 15°. The two molecule-like disks, D = 825 nm and 960 nm, are arranged to form a 1.5 μm face-centered unit cell with the area-fill factors F = 0.24 and 0.32. The two strong absorption bands at 2.99 μm and 3.40 μm have a maximal absorptivity of 92% and 90% at normal incidence, exhibiting consistency with that predicted by their area-fill factors in Fig. 3(d). The absorptivity in both peaks remains at more than 84% at an oblique incident angle. By effectively modifying the disk sizes and area-fill factors, as well as the SiO2 spacer thickness, such dual-band absorber configuration can achieve high absorptivity and also offer wide-angle polarization independent flat absorption bands over an angle of incidence of 50° compared with the H-shaped metamaterial coating [15]. It is worth to note that the LSPP mode in each metal disk is highly localized, and independent to periodicity. Therefore the angle-independent absorptivity from the multiple-size disk array is expected, and we also verified it with RCWA simulation.

 

Fig. 4 (a) Experimental absorptivity of the broadband absorber composed of the multi-sized disks with D = 800 nm, 900 nm, 1.03 μm, 1.12 μm, 1.21 μm, and 1.35 μm and a SiO2 spacer thickness, tSiO2 = 32 nm. (b) Absorptivity of the dual-band absorber consisting of two different disk sizes with dimensions D = 825 nm, and 960 nm per unit cell when tSiO2 = 80 nm. The insets show the SEM images of one unit cell for the fabricated broadband and dual-band absorbers.

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4. Conclusion

In conclusion, we have presented a method to control the absorptivity of the MD absorber by modifying its area-fill factor. Because the LSPP resonances for the MD absorbers are not affected by their array periodicities, a broadband emitter composed of a multi-sized MD array can be realized. An angle and polarization independent dual-band absorber with two maximal absorptivity over 84% can be achieved by controlling the disk sizes and fill factor. The angle of incidence for the absorber can achieve nearly 90° in the operating mid-infrared region from 2.85 μm to 3.65 μm. The approach is applicable for thermal photovoltaic, sensor, and camouflage applications.

Acknowledgment

The authors would like thank the Center for Nano Science & Technology, National Chiao Tung University (NCTU) for the fabrication facilities support. This study is based on research supported by the National Science Council (NSC) of ROC, Taiwan under Grant No. NSC-99-2112-M-001-033-MY3 and by the Grant of the Academia Sinica, Taiwan.

References and links

1. K. B. Alici and E. Ozbay, “Photonic metamaterial absorber designs for infrared solar cell applications,” Proc. SPIE 7772, 77721B (2011).

2. V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater. 22(43), 4794–4808 (2010). [CrossRef]   [PubMed]  

3. K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett. 93(12), 121904 (2008). [CrossRef]  

4. X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett. 93(24), 241108 (2008). [CrossRef]  

5. N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett. 10(7), 2342–2348 (2010). [CrossRef]   [PubMed]  

6. C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett. 98(15), 153108 (2011). [CrossRef]   [PubMed]  

7. E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett. 95(4), 043113 (2009). [CrossRef]  

8. Y.-T. Chang, Y.-C. Lai, C.-T. Li, C.-K. Chen, and T.-J. Yen, “A multi-functional plasmonic biosensor,” Opt. Express 18(9), 9561–9569 (2010). [CrossRef]   [PubMed]  

9. F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett. 98(13), 133118 (2011). [CrossRef]  

10. A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett. 9(6), 2311–2315 (2009). [CrossRef]   [PubMed]  

11. A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater. 8(11), 867–871 (2009). [CrossRef]   [PubMed]  

12. W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett. 11(1), 8–15 (2011). [CrossRef]   [PubMed]  

13. C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett. 20(13), 1103–1105 (2008). [CrossRef]  

14. C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett. 36(8), 1440–1442 (2011). [CrossRef]   [PubMed]  

15. Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano 5(6), 4641–4647 (2011). [CrossRef]   [PubMed]  

16. R. Siegel and J. Howell, Thermal Radiation Heat Transfer (Hemisphere Publishing Corporation, New York, 1981).

17. P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett. 98(7), 073111 (2011). [CrossRef]  

18. M. Diem, T. Koschny, and C. M. Soukoulis, “Wide-angle perfect absorber/thermal emitter in the terahertz regime,” Phys. Rev. B 79(3), 033101 (2009). [CrossRef]  

19. X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett. 107(4), 045901 (2011). [CrossRef]   [PubMed]  

20. M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett. 98(12), 121116 (2011). [CrossRef]  

21. T. J. Coutts, “A review of progress in thermophotovoltaic generation of electricity,” Renew. Sustain. Energy Rev. 3(2-3), 77–184 (1999). [CrossRef]  

22. M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys. 100(6), 063704 (2006). [CrossRef]  

23. C. Wu, B. Neuner III, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B 84(7), 075102 (2011). [CrossRef]  

24. J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett. 96, 251104 (2010).

25. K. B. Alici, A. B. Turhan, C. M. Soukoulis, and E. Ozbay, “Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration,” Opt. Express 19(15), 14260–14267 (2011). [CrossRef]   [PubMed]  

26. M. G. Moharam, E. B. Grann, D. A. Pommet, and T. K. Gaylord, “Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings,” J. Opt. Soc. Am. A 12(5), 1068–1076 (1995). [CrossRef]  

27. E. D. Palik, Handbook of Optical Constants of Solids (Academic, Boston, 1985).

28. R. Gordon, “Light in a subwavelength slit in a metal: propagation and reflection,” Phys. Rev. B 73(15), 153405 (2006). [CrossRef]  

29. D. F. Swinehart, “The beer-lambert law,” J. Chem. Educ. 39(7), 333–335 (1962). [CrossRef]  

30. V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett. 8(12), 4391–4397 (2008). [CrossRef]   [PubMed]  

References

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  1. K. B. Alici and E. Ozbay, “Photonic metamaterial absorber designs for infrared solar cell applications,” Proc. SPIE7772, 77721B (2011).
  2. V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
    [CrossRef] [PubMed]
  3. K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
    [CrossRef]
  4. X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
    [CrossRef]
  5. N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
    [CrossRef] [PubMed]
  6. C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
    [CrossRef] [PubMed]
  7. E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
    [CrossRef]
  8. Y.-T. Chang, Y.-C. Lai, C.-T. Li, C.-K. Chen, and T.-J. Yen, “A multi-functional plasmonic biosensor,” Opt. Express18(9), 9561–9569 (2010).
    [CrossRef] [PubMed]
  9. F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
    [CrossRef]
  10. A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
    [CrossRef] [PubMed]
  11. A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
    [CrossRef] [PubMed]
  12. W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett.11(1), 8–15 (2011).
    [CrossRef] [PubMed]
  13. C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
    [CrossRef]
  14. C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
    [CrossRef] [PubMed]
  15. Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
    [CrossRef] [PubMed]
  16. R. Siegel and J. Howell, Thermal Radiation Heat Transfer (Hemisphere Publishing Corporation, New York, 1981).
  17. P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
    [CrossRef]
  18. M. Diem, T. Koschny, and C. M. Soukoulis, “Wide-angle perfect absorber/thermal emitter in the terahertz regime,” Phys. Rev. B79(3), 033101 (2009).
    [CrossRef]
  19. X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
    [CrossRef] [PubMed]
  20. M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
    [CrossRef]
  21. T. J. Coutts, “A review of progress in thermophotovoltaic generation of electricity,” Renew. Sustain. Energy Rev.3(2-3), 77–184 (1999).
    [CrossRef]
  22. M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys.100(6), 063704 (2006).
    [CrossRef]
  23. C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
    [CrossRef]
  24. J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).
  25. K. B. Alici, A. B. Turhan, C. M. Soukoulis, and E. Ozbay, “Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration,” Opt. Express19(15), 14260–14267 (2011).
    [CrossRef] [PubMed]
  26. M. G. Moharam, E. B. Grann, D. A. Pommet, and T. K. Gaylord, “Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings,” J. Opt. Soc. Am. A12(5), 1068–1076 (1995).
    [CrossRef]
  27. E. D. Palik, Handbook of Optical Constants of Solids (Academic, Boston, 1985).
  28. R. Gordon, “Light in a subwavelength slit in a metal: propagation and reflection,” Phys. Rev. B73(15), 153405 (2006).
    [CrossRef]
  29. D. F. Swinehart, “The beer-lambert law,” J. Chem. Educ.39(7), 333–335 (1962).
    [CrossRef]
  30. V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
    [CrossRef] [PubMed]

2011

K. B. Alici and E. Ozbay, “Photonic metamaterial absorber designs for infrared solar cell applications,” Proc. SPIE7772, 77721B (2011).

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett.11(1), 8–15 (2011).
[CrossRef] [PubMed]

C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
[CrossRef] [PubMed]

K. B. Alici, A. B. Turhan, C. M. Soukoulis, and E. Ozbay, “Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration,” Opt. Express19(15), 14260–14267 (2011).
[CrossRef] [PubMed]

2010

Y.-T. Chang, Y.-C. Lai, C.-T. Li, C.-K. Chen, and T.-J. Yen, “A multi-functional plasmonic biosensor,” Opt. Express18(9), 9561–9569 (2010).
[CrossRef] [PubMed]

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
[CrossRef] [PubMed]

2009

M. Diem, T. Koschny, and C. M. Soukoulis, “Wide-angle perfect absorber/thermal emitter in the terahertz regime,” Phys. Rev. B79(3), 033101 (2009).
[CrossRef]

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
[CrossRef] [PubMed]

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

2008

K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
[CrossRef]

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
[CrossRef] [PubMed]

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

2006

R. Gordon, “Light in a subwavelength slit in a metal: propagation and reflection,” Phys. Rev. B73(15), 153405 (2006).
[CrossRef]

M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys.100(6), 063704 (2006).
[CrossRef]

1999

T. J. Coutts, “A review of progress in thermophotovoltaic generation of electricity,” Renew. Sustain. Energy Rev.3(2-3), 77–184 (1999).
[CrossRef]

1995

1962

D. F. Swinehart, “The beer-lambert law,” J. Chem. Educ.39(7), 333–335 (1962).
[CrossRef]

Abbas, M. N.

C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
[CrossRef] [PubMed]

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

Alici, K. B.

Atkinson, R.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Atwater, H. A.

V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
[CrossRef] [PubMed]

V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
[CrossRef] [PubMed]

K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
[CrossRef]

Bartal, G.

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

Berger, R.

A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
[CrossRef] [PubMed]

Carminati, R.

M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys.100(6), 063704 (2006).
[CrossRef]

Chang, P.-E.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

Chang, Y. C.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Chang, Y.-C.

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
[CrossRef] [PubMed]

Chang, Y.-T.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

Y.-T. Chang, Y.-C. Lai, C.-T. Li, C.-K. Chen, and T.-J. Yen, “A multi-functional plasmonic biosensor,” Opt. Express18(9), 9561–9569 (2010).
[CrossRef] [PubMed]

Chang, Z.-C.

Chen, C. Y.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Chen, C.-K.

Chen, H.-H.

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

Cheng, C.-W.

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
[CrossRef] [PubMed]

Coutts, T. J.

T. J. Coutts, “A review of progress in thermophotovoltaic generation of electricity,” Renew. Sustain. Energy Rev.3(2-3), 77–184 (1999).
[CrossRef]

Cubukcu, E.

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

Diem, M.

M. Diem, T. Koschny, and C. M. Soukoulis, “Wide-angle perfect absorber/thermal emitter in the terahertz regime,” Phys. Rev. B79(3), 033101 (2009).
[CrossRef]

Evans, P.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Ferry, V. E.

V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
[CrossRef] [PubMed]

V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
[CrossRef] [PubMed]

Fujikawa, S.

W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett.11(1), 8–15 (2011).
[CrossRef] [PubMed]

Gaylord, T. K.

Giessen, H.

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Gordon, R.

R. Gordon, “Light in a subwavelength slit in a metal: propagation and reflection,” Phys. Rev. B73(15), 153405 (2006).
[CrossRef]

Grann, E. B.

Greffet, J.-J.

M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys.100(6), 063704 (2006).
[CrossRef]

Hao, J.

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Hendren, W.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Hentschel, M.

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Ho, K.-M.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Hu, X.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Jiang, Y. W.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Jiang, Y.-W.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

Jiang, Z. H.

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

John, J.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Jokerst, N. M.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

Kabashin, A. V.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Koschny, T.

M. Diem, T. Koschny, and C. M. Soukoulis, “Wide-angle perfect absorber/thermal emitter in the terahertz regime,” Phys. Rev. B79(3), 033101 (2009).
[CrossRef]

Kreiter, M.

A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
[CrossRef] [PubMed]

Kubo, W.

W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett.11(1), 8–15 (2011).
[CrossRef] [PubMed]

Lai, Y.-C.

Laroche, M.

M. Laroche, R. Carminati, and J.-J. Greffet, “Near-field thermophotovoltaic energy conversion,” J. Appl. Phys.100(6), 063704 (2006).
[CrossRef]

Lee, P.-T.

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

Lee, S. C.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Lee, S.-C.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

Leung, W. Y.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Li, C.-T.

Li, M.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Lin, J.-W.

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

Lin, S.-Y.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Liu, N.

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Liu, X.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Lu, S.-P.

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

Martí, J.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Martínez, A.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Martínez-Marco, M.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Mayer, T. S.

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

Mesch, M.

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Milder, A.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Moharam, M. G.

Munday, J. N.

V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
[CrossRef] [PubMed]

Nakayama, K.

K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
[CrossRef]

Neuner, B.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Ortuño, R.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Ozbay, E.

Pacifici, D.

V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
[CrossRef] [PubMed]

Padilla, W. J.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Park, Y.-S.

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

Pastkovsky, S.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Podolskiy, V. A.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Pollard, R.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Pommet, D. A.

Qiu, M.

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Rietzler, U.

A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
[CrossRef] [PubMed]

Rodríguez-Cantó, P. J.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Rodríguez-Fortuño, F. J.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Savoy, S.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Shih, M. H.

Shih, M.-H.

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

Shvets, G.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Soukoulis, C. M.

Starr, A. F.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

Starr, T.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

Sweatlock, L. A.

V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
[CrossRef] [PubMed]

Swinehart, D. F.

D. F. Swinehart, “The beer-lambert law,” J. Chem. Educ.39(7), 333–335 (1962).
[CrossRef]

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K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
[CrossRef]

Tomás-Navarro, B.

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

Toor, F.

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

Tsai, C.-Y.

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

Tsai, D. P.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Tsai, M. W.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

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Tyler, T.

X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

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P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

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A. Unger, U. Rietzler, R. Berger, and M. Kreiter, “Sensitivity of crescent-shaped metal nanoparticles to attachment of dielectric colloids,” Nano Lett.9(6), 2311–2315 (2009).
[CrossRef] [PubMed]

Wang, C. M.

C.-W. Cheng, M. N. Abbas, Z.-C. Chang, M. H. Shih, C. M. Wang, M. C. Wu, and Y.-C. Chang, “Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array,” Opt. Lett.36(8), 1440–1442 (2011).
[CrossRef] [PubMed]

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Wang, J.

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Weiss, T.

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Werner, D. H.

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

Wu, C.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

Wu, M. C.

Wu, Y.-T.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

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A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Ye, Y. H.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
[CrossRef]

Ye, Y.-H.

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

Ye, Z.

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

Yen, T.-J.

Yun, S.

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

Zayats, A. V.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
[CrossRef] [PubMed]

Zhang, S.

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

Zhang, X.

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

Zhou, L.

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

Zollars, B.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B84(7), 075102 (2011).
[CrossRef]

ACS Nano

Z. H. Jiang, S. Yun, F. Toor, D. H. Werner, and T. S. Mayer, “Conformal dual-band near-perfectly absorbing mid-infrared metamaterial coating,” ACS Nano5(6), 4641–4647 (2011).
[CrossRef] [PubMed]

Adv. Mater.

V. E. Ferry, J. N. Munday, and H. A. Atwater, “Design considerations for plasmonic photovoltaics,” Adv. Mater.22(43), 4794–4808 (2010).
[CrossRef] [PubMed]

Appl. Phys. Lett.

K. Nakayama, K. Tanabe, and H. A. Atwater, “Plasmonic nanoparticle enhanced light absorption in GaAs solar cells,” Appl. Phys. Lett.93(12), 121904 (2008).
[CrossRef]

X. Hu, M. Li, Z. Ye, W. Y. Leung, K.-M. Ho, and S.-Y. Lin, “Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings,” Appl. Phys. Lett.93(24), 241108 (2008).
[CrossRef]

C.-Y. Tsai, S.-P. Lu, J.-W. Lin, and P.-T. Lee, “High sensitivity plasmonic index sensor using slablike gold nanoring arrays,” Appl. Phys. Lett.98(15), 153108 (2011).
[CrossRef] [PubMed]

E. Cubukcu, S. Zhang, Y.-S. Park, G. Bartal, and X. Zhang, “Split ring resonator sensors for infrared detection of single molecular monolayers,” Appl. Phys. Lett.95(4), 043113 (2009).
[CrossRef]

P.-E. Chang, Y.-W. Jiang, H.-H. Chen, Y.-T. Chang, Y.-T. Wu, L. D.-C. Tzuang, Y.-H. Ye, and S.-C. Lee, “Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances,” Appl. Phys. Lett.98(7), 073111 (2011).
[CrossRef]

M. N. Abbas, C.-W. Cheng, Y.-C. Chang, M.-H. Shih, H.-H. Chen, and S.-C. Lee, “Angle and polarization independent narrow-band thermal emitter made of metallic disk on SiO2,” Appl. Phys. Lett.98(12), 121116 (2011).
[CrossRef]

F. J. Rodríguez-Fortuño, M. Martínez-Marco, B. Tomás-Navarro, R. Ortuño, J. Martí, A. Martínez, and P. J. Rodríguez-Cantó, “Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses,” Appl. Phys. Lett.98(13), 133118 (2011).
[CrossRef]

IEEE Photon. Technol. Lett.

C. M. Wang, Y. C. Chang, M. W. Tsai, Y. H. Ye, C. Y. Chen, Y. W. Jiang, S. C. Lee, and D. P. Tsai, “Angular independent infrared filter assisted by localized surface plasmon polariton,” IEEE Photon. Technol. Lett.20(13), 1103–1105 (2008).
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V. E. Ferry, L. A. Sweatlock, D. Pacifici, and H. A. Atwater, “Plasmonic nanostructure design for efficient light coupling into solar cells,” Nano Lett.8(12), 4391–4397 (2008).
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W. Kubo and S. Fujikawa, “Au double nanopillars with nanogap for plasmonic sensor,” Nano Lett.11(1), 8–15 (2011).
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[CrossRef] [PubMed]

N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, “Infrared perfect absorber and its application as plasmonic sensor,” Nano Lett.10(7), 2342–2348 (2010).
[CrossRef] [PubMed]

Nat. Mater.

A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A. Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, “Plasmonic nanorod metamaterials for biosensing,” Nat. Mater.8(11), 867–871 (2009).
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X. Liu, T. Tyler, T. Starr, A. F. Starr, N. M. Jokerst, and W. J. Padilla, “Taming the blackbody with infrared metamaterials as selective thermal emitters,” Phys. Rev. Lett.107(4), 045901 (2011).
[CrossRef] [PubMed]

J. Hao, J. Wang, X. Liu, W. J. Padilla, L. Zhou, and M. Qiu, “High performance optical absorber based on a plasmonic metamaterial,” Phys. Rev. Lett.96, 251104 (2010).

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Figures (4)

Fig. 1
Fig. 1

(a) Schematic diagram of the investigated MD structure. (b) SEM image of a fabricated MD structure. The inset shows the details of the structure within one unit cell at a 35° angle of view.

Fig. 2
Fig. 2

(a) TM- and (b) TE- mode stimulated reflectance spectra of the MD structure with D = 1 μm, Λ = 1.5 μm, tAg = 100 nm, and tSiO2 = 80 nm.

Fig. 3
Fig. 3

(a) Comparison of the calculated and measured wavelengths of resonances as functions of the disk diameter D. (b) Absorptivities at normal incidence of the 1 μm MD arrays with several different periodicities Λ. (c) Absorptivities of the MD arrays with different diameters D for Λ fixed at 3 μm. (d) Experimental peak absorptivity of the MD configuration as a function of its area-fill factor F.

Fig. 4
Fig. 4

(a) Experimental absorptivity of the broadband absorber composed of the multi-sized disks with D = 800 nm, 900 nm, 1.03 μm, 1.12 μm, 1.21 μm, and 1.35 μm and a SiO2 spacer thickness, tSiO2 = 32 nm. (b) Absorptivity of the dual-band absorber consisting of two different disk sizes with dimensions D = 825 nm, and 960 nm per unit cell when tSiO2 = 80 nm. The insets show the SEM images of one unit cell for the fabricated broadband and dual-band absorbers.

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