Discrimination of orbital angular momentum modes of the terahertz vortex beam using a diffractive mode transformer

被引：36
|
作者：
Liu, Changming [1 ]
Wei, Xuli [1 ]
Niu, Liting [1 ]
Wang, Kejia [1 ]
Yang, Zhengang [1 ]
Liu, Jinsong [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
来源：
OPTICS EXPRESS | 2016年 / 24卷 / 12期
基金：
中国国家自然科学基金;
关键词：
LIGHT; TRANSMISSION; ELEMENTS; PHOTONS; CHANNEL; STATES;
D O I：
10.1364/OE.24.012534
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present an efficient method to discriminate orbital angular momentum (OAM) of the terahertz (THz) vortex beam using a diffractive mode transformer. The mode transformer performs a log-polar coordinate transformation of the input THz vortex beam, which consists of two 3D-printed diffractive elements. A following lens separates each transformed OAM mode to a different lateral position in its focal plane. This method enables a simultaneous measurement over multiple OAM modes of the THz vortex beam. We experimentally demonstrate the measurement of seven individual OAM modes and two multiplexed OAM modes, which is in good agreement with simulations. (c) 2016 Optical Society of America
引用
收藏
页码：12534 / 12541
页数：8
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