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

Siwen Zhang; Haitao Liu; Guoguang Mu

doi:10.1117/12.870430

4 November 2010 Resonance mechanism for the electromagnetic enhancement by an isolated subwavelength metallic groove

Siwen Zhang, Haitao Liu, Guoguang Mu

Proceedings Volume 7848, Holography, Diffractive Optics, and Applications IV; 784802 (2010) https://doi.org/10.1117/12.870430
Event: Photonics Asia 2010, 2010, Beijing, China

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.

Citation Download Citation

Siwen Zhang, Haitao Liu, and Guoguang Mu "Resonance mechanism for the electromagnetic enhancement by an isolated subwavelength metallic groove", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 784802 (4 November 2010); https://doi.org/10.1117/12.870430

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