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

F. Beck, E. Verhagen, S. Mokkapati, A. Polman, K. R. Catchpole

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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.

Original languageEnglish
Pages (from-to)A146-A156
JournalOptics Express
Issue number102
Publication statusPublished - 14 Mar 2011
Externally publishedYes

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