Scalable detection of photonic topological charge using radial phase grating
Scalable detection of photonic topological charge using radial phase grating
复制标题
DOI：
10.1063/1.5011715
复制
发表时间：
2018-03
影响因子：
4
通讯作者：
Rui Chen;Xiaoqiang Zhang;Jinghao Wang;Qian Zhao;Anting Wang;Q. Zhan
中科院分区：
文献类型：
--
作者：
Rui Chen;Xiaoqiang Zhang;Jinghao Wang;Qian Zhao;Anting Wang;Q. Zhan
提出并论证了一种利用径向相位光栅检测涡旋光束光子拓扑荷的方法。TC的模量可以通过远场衍射图案的暗条纹的数量来获得，并且TC的符号由图案的取向来确定。用该方案证明了高达±120的TC的检测。此外，通过研究不同光栅方位角周期和光栅中心与涡旋光束之间的距离时的图样演化，表明该检测方案具有良好的对准容差，对光栅参数没有严格的要求。
A method to detect the photonic topological charges (TCs) of optical vortex beams using a radial phase grating is proposed and demonstrated. The modulus of TCs can be obtained by the number of dark stripes of far-field diffraction patterns, and the sign of TCs is determined by the orientation of the patterns. The detection of TCs up to ±120 is demonstrated with this scheme. In addition, through investigating the evolution of patterns with various azimuthal periods of the grating and the distance between the centers of the grating and vortex beams, we show that this detection scheme has excellent alignment tolerance and does not have stringent requirements on the parameters of the grating.