Chinese Optics Letters, Vol. 17, Issue 11, 111603 (2019)
Reconfigurable continuous-zoom metalens in visible band
Yuan Cui1, Guoxing Zheng1,2, Ming Chen3, Yilun Zhang3, Yan Yang4, Jin Tao2, Taotao He1, and Zile Li1,2,*
- 1Electronic Information School, Wuhan University, Wuhan 430072, China
- 2NOEIC, State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China
- 3Photonics Research Centre, Guilin University of Electronic Technology, Guilin 541004, China
- 4Integrated Circuit Advanced Process Center, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
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.