Qian Jie, Hong Qi, Wang Zi-Yuan, Wu Wen-Xin, Yang Yihao, Hu Can-Ming, You Jian-Qiang, Wang Yi-Pu
Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, State Key Laboratory for Extreme Photonics and Instrumentation, School of Physics, Zhejiang University, Hangzhou, China.
State Key Laboratory of Precision Spectroscopy, Institute of Quantum Science and Precision Measurement, East China Normal University, Shanghai, China.
Nat Commun. 2025 Aug 29;16(1):8100. doi: 10.1038/s41467-025-63305-5.
Chiral coupling offers alternative avenues for controlling and exploiting light-matter interactions. We demonstrate that chiral coupling can be utilized to achieve unidirectional perfect absorption. In our experiments, chiral magnon-photon coupling is realized by coupling the magnon modes in yttrium iron garnet (YIG) spheres with spin-momentum-locked waveguide modes supported by spoof surface plasmon polaritons (SSPPs). These photon modes exhibit transverse spin, with the spin direction determined by the propagation direction. Due to the intrinsic spin properties of the magnon mode, it exclusively couples with microwaves traveling in one direction, effectively suppressing the reflection channel. Under the critical coupling condition, transmission is also eliminated, resulting in unidirectional perfect absorption. By incorporating additional YIG spheres, bidirectional and multi-frequency perfect absorption can be achieved. Our work introduces a functional platform for exploring and harnessing chiral light-matter interactions within spin-momentum locked devices, offering a paradigm for unidirectional signal processing and energy harvesting technologies.
手性耦合为控制和利用光与物质的相互作用提供了替代途径。我们证明了手性耦合可用于实现单向完美吸收。在我们的实验中，通过将钇铁石榴石（YIG）球体中的磁振子模式与由仿表面等离激元极化子（SSPPs）支持的自旋动量锁定波导模式耦合，实现了手性磁振子 - 光子耦合。这些光子模式表现出横向自旋，自旋方向由传播方向决定。由于磁振子模式的固有自旋特性，它仅与沿一个方向传播的微波耦合，有效抑制了反射通道。在临界耦合条件下，透射也被消除，从而实现单向完美吸收。通过加入额外的YIG球体，可以实现双向和多频完美吸收。我们的工作引入了一个功能平台，用于探索和利用自旋动量锁定器件中的手性光与物质相互作用，为单向信号处理和能量收集技术提供了一个范例。
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