Subwavelength light focusing of plasmonic lens with dielectric filled nanoslits structures

Hao Wang; Yongqiang Deng; Jiayu He; Ping Gao; Na Yao; Changtao Wang; Zeyu Zhao; Jiong Wang; Bo Jiang; Xiangang Luo

doi:10.1117/1.JNP.8.083079

18 July 2014 Subwavelength light focusing of plasmonic lens with dielectric filled nanoslits structures

Hao Wang, Yongqiang Deng, Jiayu He, Ping Gao, Na Yao, Changtao Wang, Zeyu Zhao, Jiong Wang, Bo Jiang, Xiangang Luo

Author Affiliations +

Funded by: 973 Program of China, Chinese Nature Science

Journal of Nanophotonics, Vol. 8, Issue 1, 083079 (July 2014). https://doi.org/10.1117/1.JNP.8.083079

Abstract

A plasmonic lens composed of a dielectric-filled nanoslits structure on an aluminum film is proposed and experimentally demonstrated. The slits’ structure is designed with equal distance, length, and width, but filled with variant thickness SiO₂ dielectric for specific phase retardations. A dual focused ion beam instrument is employed to mill the slits and deposit SiO₂ into the slits. The phase modulation by SiO₂-filled slits is illustrated by a double slits interference experiment. The light focusing behavior of the fabricated plasmonic lens is experimentally characterized by a scanning near-field optical microscope. Experimental results show good agreement with the simulations.

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Hao Wang, Yongqiang Deng, Jiayu He, Ping Gao, Na Yao, Changtao Wang, Zeyu Zhao, Jiong Wang, Bo Jiang, and Xiangang Luo "Subwavelength light focusing of plasmonic lens with dielectric filled nanoslits structures," Journal of Nanophotonics 8(1), 083079 (18 July 2014). https://doi.org/10.1117/1.JNP.8.083079

Published: 18 July 2014

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