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

Beck, F. J., Verhagen, E., Mokkapati, Sudha, Polman, A. and Catchpole, K. R. 2011. Resonant SPP modes supported by discrete metal nanoparticles on high-index substrates. Optics Express 19 (S2) , A146-A156. 10.1364/OE.19.00A146

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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.

Item Type: Article
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Optical Society of America
ISSN: 1094-4087
Last Modified: 23 Jan 2020 04:16

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