Web Release Date: October 18,
Tunability of the Refractive Index of Gold Nanoparticle Dispersions
and
Department of Chemistry and Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, and Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
Received August 2, 2007
Revised October 3, 2007
Abstract:
Alkanethiol-capped gold nanoparticles dispersed in n-dodecane were studied by spectroscopic ellipsometry and were modeled using Mie scattering theory. The refractive index in the visible and near-infrared depended on the volume fraction of gold nanoparticles, in good agreement with the theoretical expectation that such dispersed plasmonic nanoparticles can act as low or tunable refractive index materials at specific optical wavelengths.
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