Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector

R. S A Sesuraj*, T. L. Temple, D. M. Bagnall

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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.

Original languageEnglish
Title of host publicationPlasmonics: Metallic Nanostructures and Their Optical Properties X
EditorsMark I. Stockman
Pages845721-1-845721-6
Number of pages6
Volume8457
DOIs
Publication statusPublished - 2012
EventPlasmonics: Metallic Nanostructures and Their Optical Properties X - San Diego, CA, United States
Duration: 12 Aug 201216 Aug 2012

Other

OtherPlasmonics: Metallic Nanostructures and Their Optical Properties X
CountryUnited States
CitySan Diego, CA
Period12/08/1216/08/12

Keywords

  • Ag
  • Electron beam lithography
  • FDTD
  • Nanodisc
  • Plasmonic
  • Reflector
  • Scattering
  • Solar cells

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