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arXiv 2108.09704physics.optics
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基于光线跟踪改进光学坐标变换的超表面OAM模式分选

Sorting OAM modes with metasurfaces based on raytracing improved optical coordinate transformation

Zhibing Liu, Jiahui Zou, Zhaoyu Lai, Jiajing Tu, Shecheng Gao, Weiping Liu, Zhaohui Li

摘要:

光学坐标变换(OCT)在轨道角动量(OAM)复用(解复用)或操纵领域受到广泛关注,但OCT的失真会影响其性能。本文从光线光学的角度对OCT的畸变进行了定量分析,并解释了其在非垂直入射光下工作的合理性。对于对数极坐标变换(LPCT)的特殊情况下,我们使用光线跟踪辅助优化方案,以改善其失真,这是一个基于Zernike多项式的相位补偿。经过光线追迹优化后,聚焦光线的均方根误差(RMSE)减小到原来的1/5,物理光学模拟也有很大的改善。在实验中,我们使用了三个由超颖表面实现的相位掩模,测量结果与模拟结果吻合较好。本文的结果具有很大的潜力,以提高OCT相关应用的性能。

英文摘要:

Optical coordinate transformation (OCT) has attracted widespread attention in the field of orbital angular momentum (OAM) (de)multiplexing or manipulation, but the performance of OCT would suffer from its distortion. In this paper, we quantitatively analyze the distortion of OCT from the perspective of ray optics, and explain its rationality to work under non-normal incident light. For the special case of log-polar coordinate transformation (LPCT), we use a raytracing assisted optimization scheme to improve its distortion, which is related to a Zernike polynomial based phase compensation. After raytracing optimization, the root mean square error (RMSE) of the focused rays is reduced to 1/5 of the original value and the physical optic simulation also shows great improvement. In the experiment, we use three phase masks which are realized by metasurfaces, the measured results show well consistency with the simulation. Results in this paper have great potential to improve the performance of OCT related applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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