High-efficiency polarization multiplexing metalenses

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Sun, Xueping and Ma, Rui and Pu, Xinxin and Ge, Shaobo and Cheng, Jin and Li, Xiangyang and Wang, Quan and Zhou, Shun and Liu, Weiguo (2022) High-efficiency polarization multiplexing metalenses. Nanomaterials, 12 (9). 1500. ISSN 2079-4991 (https://doi.org/10.3390/nano12091500)

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Abstract

The polarization multiplexing technique is a well-established method that improves the communication capacity of an optical system. In this paper, we designed orthogonal linear and circular polarization multiplexing metalens using a library of rectangle TiO2 nanostructures. The former can independently focus x- and y-linearly polarized incident lights to designed positions with a focusing efficiency of 53.81% and 51.56%, respectively, whereas the latter with two preset focal points can independently control left and right circularly polarized incident lights with a focusing efficiency of 42.45% and 42.46%, respectively. We also show that both metalenses can produce diffraction-limited focal spots for four polarization states with no obvious distortion, which opens up new applications in polarization imaging and polarization detection.

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