Yuan Shixing, Chen Liao, Wang Ziwei, Deng Wentao, Hou Zhibo, Zhang Chi, Yu Yu, Wu Xiaojun, Zhang Xinliang
Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China.
School of Electronic and Information Engineering, Beihang University, 100191, Beijing, China.
Nat Commun. 2021 Sep 22;12(1):5570. doi: 10.1038/s41467-021-25881-0.
Terahertz isolators, one of the typical nonreciprocal devices that can break Lorentz reciprocity, are indispensable building blocks in terahertz systems for their critical functionality of manipulating the terahertz flow. Here, we report an integrated terahertz isolator based on the magneto-optical effect of a nonreciprocal resonator. By optimizing the magneto-optical property and the loss of the resonator, we experimentally observe unidirectional propagation with an ultrahigh isolation ratio reaching up to 52 dB and an insertion loss around 7.5 dB at ~0.47 THz. With a thermal tuning method and periodic resonances, the isolator can operate at different central frequencies in the range of 0.405-0.495 THz. This on-chip terahertz isolator will not only inspire more solutions for integrated terahertz nonreciprocal devices, but also have the feasibility for practical applications such as terahertz sensing and reducing unnecessary reflections in terahertz systems.
太赫兹隔离器是一种典型的能够打破洛伦兹互易性的非互易器件，因其在控制太赫兹流方面的关键功能，是太赫兹系统中不可或缺的组件。在此，我们报道了一种基于非互易谐振器磁光效应的集成太赫兹隔离器。通过优化谐振器的磁光特性和损耗，我们在实验中观察到了单向传播，在~0.47太赫兹处具有高达52分贝的超高隔离比和大约7.5分贝的插入损耗。通过热调谐方法和周期性谐振，该隔离器可以在0.405 - 0.495太赫兹范围内的不同中心频率下工作。这种片上太赫兹隔离器不仅将激发更多集成太赫兹非互易器件的解决方案，而且在太赫兹传感以及减少太赫兹系统中不必要的反射等实际应用方面具有可行性。
