3D analysis of surface Plasmon dispersion for SERS sensor based on inverted pyramid nanostructures

Oo, Swe Zin, Charlton, M.D.B., Pollard, M.E., Pearce, S. and Chen, R.Y. (2012) 3D analysis of surface Plasmon dispersion for SERS sensor based on inverted pyramid nanostructures. Photonics West 2012, , San Francisco, United States. 21 - 26 Jan 2012. (doi:10.1117/12.907467).

Abstract

Surface enhanced Raman scattering (SERS) can be used to amplify the Raman cross-section of signals by several orders of magnitude, when a mixed photon-Plasmon mode (surface Plasmon polaritons) couples to molecules on a nano textured metallo-dielectric substrate. In this paper we demonstrate a comprehensive 3D computational model based on Rigorous coupled wave analysis (RCWA) for the purpose of analysing propagating and localised surface Plasmon polaritons supported by planar SERS substrates based on periodic array of metal coated inverted pyramidal nanostructures. Although studies [1, 2] have explored the optical properties of inverted square pyramidal pits using simulation and experimentation, there has yet been no investigation performed on rectangular inverted pyramidal pits. Here we perform 3D modelling and simulation on rectangular pit arrays with aspect ratio 1:1.2 over 400nm thick gold. We investigate the effect of incident polarisation and electric-field density within the pits and show that inverted rectangular pyramidal pit array can be used as highly effective SERS and Plasmonic substrates.

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