Orbital angular momentum transformation of optical vortex with aluminum metasurfaces

被引：26
|
作者：
Zhang, Yuchao [1 ]
Yang, Xiaodong [1 ]
Gao, Jie [1 ]
机构：
[1] Missouri Univ Sci & Technol, Dept Mech & Aerosp Engn, Rolla, MO 65409 USA
来源：
SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期
基金：
美国国家科学基金会;
关键词：
BROAD-BAND; BEAMS; GENERATION; METALENSES; HOLOGRAMS;
D O I：
10.1038/s41598-019-45727-6
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The orbital angular momentum (OAM) transformation of optical vortex is realized upon using aluminum metasurfaces with phase distributions derived from the caustic theory. The generated OAM transformation beam has the well-defined Bessel-like patterns with multiple designed topological charges from -1 to +2.5 including both the integer-order and fractional-order optical vortices along the propagation. The detailed OAM transformation process is observed in terms of the variations of both beam intensity and phase profiles. The dynamic distributions of OAM mode density in the transformation are further analyzed to illustrate the conservation of the total OAM. The demonstration of transforming OAM states arbitrarily for optical vortex beams will lead to many new applications in optical manipulation, quantum optics, and optical communication.
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收藏
页数：9
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