4 November 2010 Resonance mechanism for the electromagnetic enhancement by an isolated subwavelength metallic groove
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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.
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Siwen Zhang, Siwen Zhang, Haitao Liu, Haitao Liu, Guoguang Mu, 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); doi: 10.1117/12.870430; https://doi.org/10.1117/12.870430
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