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基于狭槽天线超表面的复振幅光瞳滤波器

Complex amplitude pupil filters based on metasurface with subwavelength slot antenna

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摘要

为了产生具有特殊性质的聚焦矢量光场, 根据狭槽天线与线偏振片的相似性, 设计了刻蚀有多个不同方向狭槽天线环形阵列的超表面, 作为离散型复振幅光瞳滤波器使用。以径向偏振入射光为例, 经该滤波器并经大数值孔径透镜紧聚焦后, 可获得衍射受限的超长3维光管场。结果表明, 由于狭槽天线具有局域调控入射光场振幅和相位的特性, 各个环带上具有各自特定的透射率, 同时具有特定的二元相移(0/π)分布, 可以用来实现具有特殊性质的矢量光场。这种结构的超表面对矢量光束的产生与调控提供了新途径。

Abstract

In order to generate vectorial focal field with special properties, according to the similarity between the slot antenna and linear polarizer, a metasurface with multiple subwavelength slot antenna arrays with different directions is investigated. It is used as a discrete pupil filter with complex amplitude. The incident radial polarized light passes through this filter and is focused by a high numerical aperture lens. Then the diffraction-limited ultra-long 3-D optical tube can be obtained in the focal region. Since the slot antenna can manipulate the amplitude and phase locally, every ring has its own transmittance and binary phase shift (0/π) so that it can be used to generate special vectorial focal field. This type of metasurface can guide us to find a new way for generation and manipulation of vectorial fileds.

广告组1.1 - 空间光调制器+DMD
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中图分类号:TN713+.1

DOI:10.7510/jgjs.issn.1001-3806.2017.06.008

所属栏目:激光材料与光学元件

基金项目:中央高校基本科研业务费资助项目(NS2016072)

收稿日期:2016-11-23

修改稿日期:2016-12-16

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作者单位    点击查看

蒋孝鑫:南京航空航天大学 应用物理系, 南京 211106
王吉明:南京航空航天大学 应用物理系, 南京 211106
黄鑫:南京航空航天大学 应用物理系, 南京 211106
赫崇君:南京航空航天大学 应用物理系, 南京 211106
刘友文:南京航空航天大学 应用物理系, 南京 211106

联系人作者:王吉明(jimingw@nuaa.edu.cn)

备注:蒋孝鑫(1992-), 男, 硕士研究生, 主要从事矢量光学方面的研究。

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引用该论文

JIANG Xiaoxin,WANG Jiming,HUANG Xin,HE Chongjun,LIU Youwen. Complex amplitude pupil filters based on metasurface with subwavelength slot antenna[J]. Laser Technology, 2017, 41(6): 807-811

蒋孝鑫,王吉明,黄鑫,赫崇君,刘友文. 基于狭槽天线超表面的复振幅光瞳滤波器[J]. 激光技术, 2017, 41(6): 807-811

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