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arXiv · 2202.10193

Decoupled phase modulation for circularly polarized lights via chiral metasurface

Renchao Jin·Lin Deng·Lili Tang·Yue Cao·Yongmin Liu·Zheng-Gao Dong
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Abstract

Metasurfaces are believed as one of the best candidates in nano-optical devices, attributed to the key feasible modulation features of phase, polarization, and local field enhancement by structural designing. However, current methods of propagation- and geometric-phase modulation are interrelated between two eigen spin-states. This means that when the left-handed component phase of a beam is modulated by metasurfaces, its right-handed component phase will change accordingly, which limits the versatility of spin-decoupled applications. In this paper, we experimentally and numerically demonstrate a new phase modulation pathway based on chiral V-shaped holes, which enable fully decoupled one-handed phase modulation of the two eigen spin-states. Two enantiomers are proposed to realize decoupled functions for the two eign-states, e.g., the enantiomer can manipulate the left-handed component phase of a laser beam without changes of the right-handed component. This proposed method has significant meaning in metasurfaces, which can expand the methods of phase engineering.

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Renchao Jin, Lin Deng, Lili Tang, Yue Cao, Yongmin Liu, Zheng-Gao Dong. 2022-02-21. Decoupled phase modulation for circularly polarized lights via chiral metasurface. https://arxiv.org/abs/2202.10193

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