Photonics Research, 2020, 8 (5): 05000648, Published Online: Apr. 20, 2020  

Circular Dammann gratings for enhanced control of the ring profile of perfect optical vortices Download: 573次

Author Affiliations
1 Laboratory of Information Optics and Opto-electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China
5 e-mail: Junjiey@siom.ac.cn
6 e-mail: chazhou@mail.shcnc.ac.cn
Abstract
Perfect optical vortices (POVs) provide a solution to address the challenge induced by strong dependence of classical optical vortices on their carried topological charges. However, traditional POVs are all shaped into bright rings with a single main lobe along the radial direction. Here we propose a method for enhanced control on the ring profile (the radial intensity profile of circular rings) of POVs based on modulated circular sine/cosine radial functions, which is realized by a circular Dammann grating embedded with a spiral phase. Specifically, a type of “absolute” dark POVs surrounded by two bright lobe rings in each side is presented, which provides a perfect annular potential well along those dark impulse rings for trapping low-index particles, cells, or quantum gases. In addition, several POVs with different ring profiles, including conventional POVs with bright rings, the dark POVs mentioned above, and also POVs with tunable ring profiles, are demonstrated. This work opens up new possibilities to controllably tune the ring profile of perfect vortices, and this type of generalized POVs will enrich the content of singular optics and expand the application scope of perfect vortices in a range of areas including optical manipulation, both quantum and classical optical communications, enhanced optical imaging, and also novel structured pumping lasers.

Junjie Yu, Chaofeng Miao, Jun Wu, Changhe Zhou. Circular Dammann gratings for enhanced control of the ring profile of perfect optical vortices[J]. Photonics Research, 2020, 8(5): 05000648.

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