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26 November 2012 Impact of surface waves on the electromagnetic enhancement by a metallic nano-cavity
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Abstract
To investigate the impact of surface waves on the electromagnetic enhancement, here we consider a simple geometry of a T-shaped metallic nano-groove that is composed of a narrow central groove and of a wide top trench under illumination by a plane wave. The T-shaped groove is found to have a much higher enhancement factor than a single bare groove without the top trench. By building up an intuitive surface-wave model, the improved field enhancement is attributed to the surface waves that are collected by the top trench and are coupled into the central groove.
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Haitao Liu and Zhiwen Zeng "Impact of surface waves on the electromagnetic enhancement by a metallic nano-cavity", Proc. SPIE 8556, Holography, Diffractive Optics, and Applications V, 85560D (26 November 2012); https://doi.org/10.1117/12.999873
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