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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47373

Title: Creating Optical Near-Field Orbital Angular Momentum in a Gold Metasurface
Authors: Chen-Bin Huang
Ching-Fu Chen
Chen-Ta Ku
Yi-Hsin Tai
Pei-Kuen Wei
Heh-Nan Lin
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: plasmonics
optical vortex
Orbital angular momentum
Date: 2015-08
Issue Date: 2018-07-17T03:13:32Z
Publisher: Nano Lett
Abstract: Abstract: Nanocavities inscribed in a gold thin film are optimized and designed to form a metasurface. We demonstrate both numerically and experimentally the creation of surface plasmon (SP) vortex carrying orbital angular momentum in the metasurface under linearly polarized optical excitation that carries no optical angular momentum. Moreover, depending on the orientation of the exciting linearly polarized light, we show that the metasurface is capable of providing dynamic switching between SP vortex formation or SP subwavelength focusing. The resulting SP intensities are experimentally measured using a near-field scanning optical microscope and are found in excellent quantitative agreements as compared to the numerical results.
Relation: 15(4) pp.2746–2750
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47373
Appears in Collections:[光電科學研究所] 期刊論文

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