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Continuously Geometric Phase Modulation by using a reflective liquid crystal structure
Lv, Yongmo1,2; Yin, Shaoyun1,2; Liu, Yi3; Li, Zhe3; Li, Peng3; Sun, Xiuhui2; Chen, Jianjun2; Yang, Zheng2; Yuan, Jiahu1,2
2022-04-15
摘要Distinguished from the dynamical phase gained by optical path difference, the geometric phase (GP) is an additional phase delay produced by the variation of polarization states when light propagates in an anisotropic medium. Its modulation amount does not depend on the thickness of the medium or the wavelength of the light, therefore, it is expected to realize smaller and faster phase modulation unit. Based on the principle that the geometric phase generated by two passes through a wave plate of circularly polarized light with the same rotation direction is four times the rotation angle of optical axis of the wave plate, a reflective phase modulation structure composed of an In-plane Switching (IPS) liquid crystal (LC) cell, a mirror and two quarter wave plates is proposed in this paper. Under the action of IPS electrodes, the LC director can rotate nearly 80 degrees in-plane to realize a 320 degrees GP modulation. Finite Difference Time Domain (FDTD) method is used to simulate the GP modulation, and an optical path for interferometric measurement is built. The experimental results are in good agreement with the simulation results. This method uses only a single layer of driving electrodes and a LC cell to achieve 320 degrees GP modulation, which avoids the alignment problem and provides a new idea for the spatial light dynamic modulator.
关键词Geometric phase Phase modulation Liquid crystal
DOI10.1016/j.optcom.2021.127847
发表期刊OPTICS COMMUNICATIONS
ISSN0030-4018
卷号509页码:5
通讯作者Yin, Shaoyun(ysy@cigit.ac.cn) ; Yuan, Jiahu(yjh@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000790469300005
语种英语