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Proceedings Paper

SERS and plasmon resonance of engineered nanoparticle arrays
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Paper Abstract

While much work has focused on simulation and measurement of plasmon resonances in noble metal nanostructures, usually the simulation tool is used as a confirmation of experimental results. In this work we use a finite difference time domain (FDTD) technique to calculate the plasmon resonance and electric field enhancement of Ag nanoparticles in regular arrays on quartz substrates. Such structures have also been prepared by e-beam lithography, and the plasmon resonance and surface-enhanced Raman scattering strength of arrays with different nanoparticle size and spacing have been investigated. Arrays of cylindrical nanoparticles were fabricated with varying particle size and interparticle spacing. The observed extinction peaks agree very well with the extinction peaks as calculated by FDTD; typically within a few percent. Experimental plasmon peak widths are considerably larger than their ideal values due to inhomogeneous broadening. As expected, the particle array with highest SERS enhancement has its plasmon resonance nearest the laser and Stokes-shifted wavelengths. We believe the FDTD modeling tool is accurate enough to use as a predictive tool for engineering plasmonic nanostructures.

Paper Details

Date Published: 26 August 2005
PDF: 8 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 592708 (26 August 2005); doi: 10.1117/12.617992
Show Author Affiliations
D. R. Chamberlin, Agilent Labs. (United States)
Z. Wang, Stanford Univ. (United States)
K. A. Sultana, Agilent Labs. (United States)
San Jose State Univ. (United States)
E. K. C. Chow, Agilent Labs. (United States)
M. M. Sigalas, Agilent Labs. (United States)
M. Liu, Agilent Labs. (United States)
A. C. Grot, Agilent Labs. (United States)
S. Fan, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 5927:
Plasmonics: Metallic Nanostructures and Their Optical Properties III
Mark I. Stockman, Editor(s)

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