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Proceedings Paper

Exploring optimized configurations of plasmonic nanoparticles
Author(s): Prathamesh Pavaskar; Jesse Theiss; Stephen B. Cronin
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Paper Abstract

Finite difference time domain (FDTD) simulations are used to find the electric field intensity at the center of a cluster of plasmonic nanoparticles irradiated by a planewave source. We use an iterative optimization algorithm to maximize the electric field intensity. The resulting optimized configurations are found to be non-symmetric and non-intuitive, and cannot be obtained by analytical calculation methods. Experimentally, we investigate a novel technique using angle evaporation to produce plasmonic nanostructures with gap sizes of 1-2 nm. We evaluate the plasmonic activity of these nanoparticles both experimentally using surface enhanced Raman spectroscopy (SERS) measurements and theoretically using FDTD simulations. These simulations predict an electric field intensity enhancement of 82,400 at the center of the nanoparticle dimer, and an electromagnetic SERS enhancement factor of 109-1010.

Paper Details

Date Published: 22 September 2010
PDF: 11 pages
Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77573P (22 September 2010); doi: 10.1117/12.871876
Show Author Affiliations
Prathamesh Pavaskar, The Univ. of Southern California (United States)
Jesse Theiss, The Univ. of Southern California (United States)
Stephen B. Cronin, The Univ. of Southern California (United States)


Published in SPIE Proceedings Vol. 7757:
Plasmonics: Metallic Nanostructures and Their Optical Properties VIII
Mark I. Stockman, Editor(s)

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