Impact of surface waves on the electromagnetic enhancement by a metallic nano-cavity

Haitao Liu; Zhiwen Zeng

doi:10.1117/12.999873

26 November 2012 Impact of surface waves on the electromagnetic enhancement by a metallic nano-cavity

Haitao Liu, Zhiwen Zeng

Proceedings Volume 8556, Holography, Diffractive Optics, and Applications V; 85560D (2012) https://doi.org/10.1117/12.999873
Event: Photonics Asia, 2012, Beijing, China

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.

Citation Download Citation

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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