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

[+] Author Affiliations
Stephen Norton, Tuan Vo Dinh

Fitzpatrick Institute for Photonics, Duke University, 112 Ellsworth Place, Cary, North Carolina 27511

J. Nanophoton. 2(1), 029501 (September 26, 2008). doi:10.1117/1.3001731
History: Received July 8, 2008; Revised September 23, 2008; Accepted September 24, 2008; September 26, 2008; Online September 26, 2008
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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.

© 2008 Society of Photo-Optical Instrumentation Engineers

Topics

Plasmons

Citation

Stephen Norton and Tuan Vo Dinh
"Spectral bounds on plasmon resonances for Ag and Au prolate and oblate nanospheroids", J. Nanophoton. 2(1), 029501 (September 26, 2008). ; http://dx.doi.org/10.1117/1.3001731


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