Transmission enhancement of light through a metallic nano-slit with periodic metallic nanostrips

Yanxia Cui; Yi Jin; Yoichi Okuno; Sailing He

doi:10.1117/12.819919

12 May 2009 Transmission enhancement of light through a metallic nano-slit with periodic metallic nanostrips

Yanxia Cui, Yi Jin, Yoichi Okuno, Sailing He

Proceedings Volume 7353, Metamaterials IV; 73530S (2009) https://doi.org/10.1117/12.819919
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

The study of the transmission properties of subwavelength apertures has become a very active area of research in electromagnetism. It is generally accepted that structuring the input surface of the metal film by periodic corrugations is very effective in the process of transmission enhancement through single apertures. Here instead of periodic corrugations, we propose to use periodic nano-strips placed before the input surface of the metal film to enhance the transmission of light through a nano-slit milled in the film. Influences of the structural parameters of periodic nano-strips on the transmission enhancement are investigated. The transmission efficiency through a 25nm-width silver nano-slit can be boosted to be η = 164 when six pairs of nano-strips are placed 50nm distant away from the incident surface of the silver film at λ0 = 1μm, which is originally η = 7.8 without any strips. This indicates that a large part of the incident light can be transformed into the localized guided wave with strong intensity, and then more light can flow through the nano-slit. We emphasize that periodic nano-strips can serve as an efficient receiving antenna to harvest light into the nano-slit.

Citation Download Citation

Yanxia Cui, Yi Jin, Yoichi Okuno, and Sailing He "Transmission enhancement of light through a metallic nano-slit with periodic metallic nanostrips", Proc. SPIE 7353, Metamaterials IV, 73530S (12 May 2009); https://doi.org/10.1117/12.819919

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