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Proceedings Paper

Radiative lifetimes of nano-plasmonic states
Author(s): David J. Bergman; Uri Evra; Xiangting Li
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Paper Abstract

The strongly localized quasi-static eigenstates (also known as surface-plasmon resonances) which are found in a small nanometric cluster of spherical inclusions can form the basis for some interesting potential applications such as SPASER and nanolens. In a SPASER, a strong coherent electric field, oscillating at a frequency ω in the visible or infra-red spectral range, can be excited in a spatial region whose linear dimensions are much smaller than the wavelength appropriate to that frequency. In a nanolens an incident electromagnetic field, oscillating at such a frequency, can be focused to a spot whose size is much less than the relevant wavelength. An important property of such resonances is their finite radiative lifetime, which is infinite in the strict quasi-static limit. One needs to solve the full Maxwell's equations in order to find the radiative decay rate, and consequently the lifetime, of such an eigenstate. We develop a method for calculating such lifetimes for clusters of closely spaced spherical inclusions. We also discuss how symmetry properties of such a cluster can be exploited to ensure that certain eigenstates have especially long radiative lifetimes.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59270I (18 August 2005); doi: 10.1117/12.613416
Show Author Affiliations
David J. Bergman, Tel Aviv Univ. (Israel)
Uri Evra, Tel Aviv Univ. (Israel)
Xiangting Li, Tel Aviv Univ. (Israel)
Shanghai Jiao Tong Univ. (China)

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

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