| Citation: | ZHANG Zhen-yu, ZHANG Wei, LIU Rui, ZHANG Jing-ying, LI Wen-hao. Simultaneous measurement of radial angular displacement and longitudinal linear displacement with cascade metasurfaces[J]. Chinese Optics. doi: 10.37188/CO.2025-0033
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To solve the problem of existing metasurface displacement measurement techniques unable to measure multiple physical quantities simultaneously, this paper proposes a metasurface cascade structure that can measure radial angular displacement and longitudinal line displacement simultaneously. First, the working principle of displacement measurement is described according to the joint phase modulation of circular polarized light by a cascade metasurface. Second, the displacement information carried by the phase delay is analyzed using the Jones transport matrix, and the angular and linear displacements are mathematically characterized. Then, the design objective is used as a constraint to optimize unit structure parameters and create metasurface models. Finally, the finite-difference time-domain method is used to simulate the metasurface structures, validate the method's feasibility, and evaluate the device's measurement performance. The results show that the angular displacement sensitivity was
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