Decoupled Phase Modulation for Circularly Polarized Light via Chiral Metasurfaces
Decoupled Phase Modulation for Circularly Polarized Light via Chiral Metasurfaces
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DOI：
10.1021/acsphotonics.2c01397
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发表时间：
2022-12
期刊：
影响因子：
7
通讯作者：
Ren-chao Jin;Lin Deng;LiLi Tang;Yue Cao;Yongmin Liu;Z. Dong
中科院分区：
文献类型：
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作者：
Ren-chao Jin;Lin Deng;LiLi Tang;Yue Cao;Yongmin Liu;Z. Dong
超表面已经成为纳米光子学领域中一个非常活跃的前沿领域，因为它们能够通过结构工程实现一些独特而实用的手段来调制相位，偏振，角动量和空间场分布。然而，目前基于传播相位和Pancharatnam − Berry相位的相位调制方法通常在每个单步调制的两个本征自旋状态之间相互关联。这意味着当左手圆偏振（LCP）光的相位被超颖表面调制时，右手圆偏振（RCP）光的相位也会改变，如果寻求自旋解耦或自旋无关的应用，则会施加实质性的限制。在本文中，我们数值和实验证明了一种新的相位调制路径的基础上手性元表面组成的V形等离子体孔径，使完全解耦的相位调制的两个本征自旋态。提出了两种对映体以实现所需的相解耦。具体地，对映异构体可以操纵光束的LCP组分的相位而不改变RCP组分的相位，反之亦然。我们的方法扩展了相位工程的方法，可以帮助我们设计用于广泛应用的新型器件，包括偏振成像，手光学检测，分子光谱学
: Metasurfaces have emerged as one highly vibrant frontier in the field of nanophotonics, since they enable some unique and practical means to modulate the phase, polarization, angular momentum, and spatial field distribution through structural engineering. However, the current methods of phase modulation based on the propagation phase and Pancharatnam − Berry phase are typically interrelated between two eigen spin states for each single-step modulation. It means that when the phase of left-handed circularly polarized (LCP) light is modulated by a metasurface, the phase of right-handed circularly polarized (RCP) light will change as well, imposing substantial constraints if spin-decoupled or spin-independent applications are sought. In this paper, we numerically and experimentally demonstrate a new phase modulation pathway based on chiral metasurfaces consisting of V-shaped plasmonic apertures, which enable fully decoupled phase modulation for the two eigen spin states. Two enantiomers are proposed to achieve the desired phase decoupling. Specifically, the enantiomer can manipulate the phase of the LCP component of a light beam without changing the phase of the RCP component, and vice versa. Our method expands the methods of phase engineering and can help us design novel devices for a wide range of applications, including polarimetric imaging, chiroptical detection, molecular spectroscopy