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Proceedings Paper

Resonance mechanism for the electromagnetic enhancement by an isolated subwavelength metallic groove
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Paper Abstract

We propose quantitative investigations of the Fabry-Perot resonance condition for the field enhancement by an isolated subwavelength metallic groove. The resonance condition is obtained from a simple Fabry-Perot model. Our calculations show that the electric field near the groove mouth that contacts the specimen is drastically enhanced under the resonance condition but is depressed out of the resonance condition. Giant electric-field enhancement can be obtained for narrow groove, which reveals nearly 108 magnification of Raman signals. A weak dependence of the electromagnetic enhancement on the metal type is presented and explained.

Paper Details

Date Published: 4 November 2010
PDF: 7 pages
Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 784802 (4 November 2010); doi: 10.1117/12.870430
Show Author Affiliations
Siwen Zhang, Nankai Univ. (China)
Haitao Liu, Nankai Univ. (China)
Guoguang Mu, Nankai Univ. (China)

Published in SPIE Proceedings Vol. 7848:
Holography, Diffractive Optics, and Applications IV
Yunlong Sheng; Chongxiu Yu; Linsen Chen, Editor(s)

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