Chinese Optics Letters, 2019, 17 (11): 111603, Published Online: Sep. 12, 2019   

Reconfigurable continuous-zoom metalens in visible band Download: 1033次

Author Affiliations
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 NOEIC, State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China
3 Photonics Research Centre, Guilin University of Electronic Technology, Guilin 541004, China
4 Integrated Circuit Advanced Process Center, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
Abstract
The design of a conventional zoom lens is always challenging because it requires not only sophisticated optical design strategy, but also complex and precise mechanical structures for system adjustment. Here, we propose a continuous-zoom lens consisting of two chiral geometric metasurfaces with dielectric nanobrick arrays sitting on a transparent substrate. The metalens can continuously vary the focal length by rotating either of the two metasurfaces around its optical axis without changing any other conditions. Due to the polarization dependence of the geometric metasurface, the positive and negative polarities are interchangeable in one identical metalens only by changing the handedness of the incident circularly polarized light, which can generate varying focal lengths ranging from ∞ to +∞ in principle.

Yuan Cui, Guoxing Zheng, Ming Chen, Yilun Zhang, Yan Yang, Jin Tao, Taotao He, Zile Li. Reconfigurable continuous-zoom metalens in visible band[J]. Chinese Optics Letters, 2019, 17(11): 111603.

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