圆二色性
手性(物理)
物理
厄米矩阵
涡流
拓扑(电路)
旋涡
联轴节(管道)
角动量
经典力学
量子力学
手征异常
结晶学
材料科学
数学
费米子
化学
组合数学
Nambu–Jona Lasinio模型
冶金
热力学
作者
Xiao Li,Chuanjie Hu,Yue Tian,Youwen Liu,Huanyang Chen,Yadong Xu,Ming‐Hui Lu,Yangyang Fu
标识
DOI:10.1016/j.scib.2023.09.028
摘要
Helical dichroism (HD) utilizing unbounded orbital angular momentum degree of freedom, has provided an important means of exploring chiral effects in diverse wave systems, surpassing the two-state constraint in circular dichroism that relies on intrinsic spin. However, the naturally feeble chiral signals that arise during wave-matter interactions pose significant challenges to the effective enlargement of HD. Here, we introduce a new paradigm for realizing maximum HD through non-Hermitian gradient metasurfaces by engineering a chiral exceptional point (EP) in intrinsic topological charge. The non-Hermitian gradient metasurfaces are empowered by the asymmetric coupling feature at the EP, enabling flexible construction to realize versatile chirality control in extreme circumstances where one chiral vortex is totally reflected and the opposite counterpart is completely absorbed or transmitted into the customized vortex modes. As the manifestation of the maximum HD, we present the first experimental demonstration of perfect chirality-selected vortex transmission in acoustics. Our findings open new venues to achieve maximum chirality and explore chiral physics of wave-matter interactions, which can boost many vortical applications in asymmetric chirality manipulation, one-way propagation, and information multiplexing.
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