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Proceedings Paper

Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector
Author(s): R. S. A. Sesuraj; T. L. Temple; D. M. Bagnall
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Paper Abstract

The scattering properties of a plasmonic array can be reinforced by placing the array near a planar reflector. Finite- Difference-Time-Domain (FDTD) simulations have been used to demonstrate the key design challenge of modulating the electric field that drives the plasmonic scattering, by varying the distance of a single Ag nanodisc from a Ag reflector. We show that the thickness of the dielectric separation layer plays a critical role in determining the spectral characteristics and the intensity of the power scattered by a Ag nanodisc near a reflector. A possible application of the designed structure as a plasmonic light-trap for thin Si solar cells is also experimentally demonstrated. Electron-beam lithography has been used to fabricate a pseudo-random array of 150nm plasmonic Ag nanodiscs on SiO2 on a Ag reflector substrate. The plasmonic reflector shows a high diffuse reflectance of ~54% in the near-infrared, near-bandgap 600-900nm wavelength region for thin Si solar cells, with a low broadband absorption loss of ~18%. Wavelength-angle resolved scattering measurements indicate an angular scattering range between 20° to 80° with maximum intensity of the scattered power in the 20° to 60° angular range.

Paper Details

Date Published: 9 October 2012
PDF: 6 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845721 (9 October 2012); doi: 10.1117/12.956502
Show Author Affiliations
R. S. A. Sesuraj, Univ. of Southampton (United Kingdom)
T. L. Temple, Macquarie Univ. (Australia)
D. M. Bagnall, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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