March 2017
Spotlight Summary by Guangyuan Li
Lattice modes and plasmonic linewidth engineering in gold and aluminum nanoparticle arrays
Surface lattice plasmons are formed by the coupling of localized surface plasmon (LSP) resonances of individual plasmonic nanoparticles and the Rayleigh anomalies due to a periodic arrangement. Because of the narrow resonance linewidth and high quality factor, they are attractive in many applications including fluorescence enhancement, plasmonic nanolasers, nonlinear optics and ultrasensitive sensing. In this work, the authors comprehensively analyze the crucial roles played not only by the periodicity, but also by the dielectric environment and by the incident polarization on the formation and properties of lattice modes. With both numerical simulations and experimental measurements of the dispersion curves, they gain insights into the nature of lattice plasmons and manage to provide design rules. Following these rules, they achieve strikingly high quality factors of several hundred for lattice modes in the visible spectrum using gold nanoparticle arrays. For lattice modes in the near-UV and visible spectral ranges using aluminum nanoparticle arrays, they obtain quality factors of the same magnitude as those obtained for isolated gold nanoparticles, although aluminum has higher intrinsic losses and worse surface roughness than gold.
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Article Information
Lattice modes and plasmonic linewidth engineering in gold and aluminum nanoparticle arrays
Dmitry Khlopin, Frédéric Laux, William P. Wardley, Jérôme Martin, Gregory A. Wurtz, Jérôme Plain, Nicolas Bonod, Anatoly V. Zayats, Wayne Dickson, and Davy Gérard
J. Opt. Soc. Am. B 34(3) 691-700 (2017) View: Abstract | HTML | PDF