High-efficiency polarization multiplexing metalenses

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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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.