Resonant SPP modes supported by discrete metal nanoparticles on high-index substrates

被引：65

作者：

Beck, F. J. ^{[2
]}

Verhagen, E. ^{[1
]}

Mokkapati, S. ^{[2
]}

Polman, A. ^{[1
]}

Catchpole, K. R. ^{[2
]}

机构：

[1] FOM Inst AMOLF, Ctr Nanophoton, NL-1098 XG Amsterdam, Netherlands

[2] Australian Natl Univ, Coll Engn & Comp Sci, Ctr Sustainable Energy Syst, Canberra, ACT 0200, Australia

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

SOLAR-CELLS; OPTICAL-ABSORPTION; SCATTERING; SILICON; ENHANCEMENT; SURFACE; DIPOLE; LIGHT;

D O I：

10.1364/OE.19.00A146

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We provide a new physical interpretation of scattering from plasmonic nanoparticles on high-index substrates. We demonstrate the excitation of different types of resonant modes on disk-shaped, Ag nanoparticles. At short wavelengths, the resonances are localised at the top of the particle, while at longer wavelengths they are localised at the Ag/substrate interface. We attribute the long wavelength resonances to geometric resonances of surface plasmon polaritons (SPPs) at the Ag/substrate interface. We show that particles that support resonant SPP modes have enhanced scattering cross-sections when placed directly on a high-index substrate; up to 7.5 times larger than that of a dipole scatterer with an equivalent free-space resonance. This has implications for designing scattering nanostructures for light trapping solar cells. (C) 2011 Optical Society of America

引用

页码：A146 / A156

页数：11

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