Sun Xueping, Ma Rui, Pu Xinxin, Ge Shaobo, Cheng Jin, Li Xiangyang, Wang Quan, Zhou Shun, Liu Weiguo
Shanxi Province Key Laboratory of Thin Films Technology and Optical Test, School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710032, China.
School of Microelectronics, Xidian University, Xi'an 710071, China.
Nanomaterials (Basel). 2022 Apr 28;12(9):1500. doi: 10.3390/nano12091500.
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 TiO 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.
偏振复用技术是一种成熟的方法，可提高光学系统的通信容量。在本文中，我们使用矩形TiO纳米结构库设计了正交线性和圆偏振复用超表面透镜。前者可以将x和y线偏振入射光分别独立地聚焦到设计位置，聚焦效率分别为53.81%和51.56%，而后者具有两个预设焦点，可以分别独立地控制左旋和右旋圆偏振入射光，聚焦效率分别为42.45%和42.46%。我们还表明，这两种超表面透镜都可以为四种偏振态产生衍射极限焦点，且无明显畸变，这为偏振成像和偏振检测开辟了新的应用。
