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Journal of Nanophotonics • Open Access

Spectral bounds on plasmon resonances for Ag and Au prolate and oblate nanospheroids

Paper Abstract

Analytical expressions for the plasmon resonance frequencies of prolate and oblate spheroids and their dependence on ellipticity are derived, and approximate bounds on these frequencies established. These formulas may be useful in tuning the plasmon resonance within certain limits. With increasing aspect ratio, the prolate spheroid resonance is red shifted relative to a sphere with no lower limit under the assumptions of a Drude dispersion model. On the other hand, the oblate resonances are blue shifted as the spheroid becomes increasingly flat, but up to a limit.

Paper Details

Date Published: 1 September 2008
PDF: 6 pages
J. Nanophoton. 2(1) 029501 doi: 10.1117/1.3001731
Published in: Journal of Nanophotonics Volume 2, Issue 1
Show Author Affiliations
Stephen John Norton, Duke Univ. (United States)
Tuan Vo Dinh, Duke Univ. (United States)

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