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Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector

Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector
Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector
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.
The International Society for Optical Engineering
Sesuraj, Rufina S.A.
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Temple, T.L.
1c5f14df-99d5-438c-b0b3-1f017e17c643
Bagnall, D.M.
5d84abc8-77e5-43f7-97cb-e28533f25ef1
Sesuraj, Rufina S.A.
2ff818d7-d4d7-4e3a-9cff-8702325ea422
Temple, T.L.
1c5f14df-99d5-438c-b0b3-1f017e17c643
Bagnall, D.M.
5d84abc8-77e5-43f7-97cb-e28533f25ef1

Sesuraj, Rufina S.A., Temple, T.L. and Bagnall, D.M. (2012) Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector. In Plasmonics: Metallic Nanostructures and Their Optical Properties X. vol. 8457, The International Society for Optical Engineering.. (doi:10.1117/12.956502).

Record type: Conference or Workshop Item (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.

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More information

Published date: 9 October 2012
Venue - Dates: SPIE Optics and Photonics 2012 : Plasmonics: Metallic Nanostructures and Their Optical Properties X, United States, 2012-10-09
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 344522
URI: https://eprints.soton.ac.uk/id/eprint/344522
PURE UUID: 7ec34633-19bf-4943-8649-527a61624b43

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Date deposited: 24 Oct 2012 13:24
Last modified: 16 Jul 2019 21:50

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Contributors

Author: Rufina S.A. Sesuraj
Author: T.L. Temple
Author: D.M. Bagnall

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