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Proceedings Paper

Comparison of novel graded refractive index tapered nanowell design against a triangle array commonly used for surface enhanced raman scattering
Author(s): Zachary A. Sechrist; Lee R. Cambrea; Ronald J. Tonucci
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Paper Abstract

A novel plasmonic surface is evaluated as a potential surface for surface enhanced Raman scattering (SERS) experiments. This paper examines the electromagnetic response of an array of gold triangles commonly used for surface enhanced Raman scattering (SERS) with a finite element simulator, and then compares those results with the theoretical performance of a novel surface described herein. The gold triangle array modeled as a standard SERS surface could be fabricated using nanosphere lithography [1]. The new design introduced in this paper utilizes a strongly tapered nanowell shape, which is etched out of a gold/alumina multilayer stack. The nanowell void creates a series of resonators stacked on top of one another, with each metal/insulator/metal combination representing one resonator. Resonators with different void radii, have different refractive indices. Therefore, the taper of the nanowell defines the vertical refractive index gradient, and the taper in this paper was chosen to span both positive and negative refractive indices within the multilayer stack. The tapered nanowell design is shown to have a very strong response, and displays a unique stability with respect to disorder within the array.

Paper Details

Date Published: 9 October 2012
PDF: 9 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84573E (9 October 2012); doi: 10.1117/12.930211
Show Author Affiliations
Zachary A. Sechrist, Naval Air Warfare Ctr. Weapons Division (United States)
Lee R. Cambrea, Naval Air Warfare Ctr. Weapons Division (United States)
Ronald J. Tonucci, Navy Research Lab. (United States)


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

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