Rao J W, Xu P C, Gui Y S, Wang Y P, Yang Y, Yao Bimu, Dietrich J, Bridges G E, Fan X L, Xue D S, Hu C-M
Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada, R3T 2N2.
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
Nat Commun. 2021 Mar 26;12(1):1933. doi: 10.1038/s41467-021-22171-7.
The perfect absorption of electromagnetic waves has promoted many applications, including photovoltaics, radar cloaking, and molecular detection. Unlike conventional methods of critical coupling that require asymmetric boundaries or coherent perfect absorption that require multiple coherent incident beams, here we demonstrate single-beam perfect absorption in an on-chip cavity magnonic device without breaking its boundary symmetry. By exploiting magnon-mediated interference between two internal channels, both reflection and transmission of our device can be suppressed to zero, resulting in magnon-induced nearly perfect absorption (MIPA). Such interference can be tuned by the strength and direction of an external magnetic field, thus showing versatile controllability. Furthermore, the same multi-channel interference responsible for MIPA also produces level attraction (LA)-like hybridization between a cavity magnon polariton mode and a cavity photon mode, demonstrating that LA-like hybridization can be surprisingly realized in a coherently coupled system.
电磁波的完美吸收推动了许多应用，包括光伏、雷达隐身和分子检测。与需要非对称边界的传统临界耦合方法或需要多个相干入射光束的相干完美吸收方法不同，在这里我们展示了在片上腔磁振子器件中实现单光束完美吸收，而不破坏其边界对称性。通过利用两个内部通道之间的磁振子介导干涉，我们器件的反射和透射都可以被抑制到零，从而产生磁振子诱导的近完美吸收（MIPA）。这种干涉可以通过外部磁场的强度和方向进行调节，从而显示出多功能的可控性。此外，导致MIPA的相同多通道干涉还会在腔磁振子极化子模式和腔光子模式之间产生类似能级吸引（LA）的杂化，表明在相干耦合系统中可以惊人地实现类似LA的杂化。
