透射率
物理
光学
波导管
拓扑(电路)
调制(音乐)
模式(计算机接口)
互惠的
点(几何)
相(物质)
特征向量
反射(计算机编程)
量子力学
几何学
计算机科学
数学
声学
操作系统
语言学
哲学
组合数学
程序设计语言
作者
Qingjie Liu,Tiantian Wang,Quan Lei,Dong Zhao,Shaolin Ke
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2023-06-30
卷期号:48 (15): 4089-4089
被引量:6
摘要
The topology of exceptional points (EPs) has been revealed by taking stationary or dynamical encircling around them, which induces eigenstate exchange or chiral mode conversion. However, the conversions are usually reciprocal obeying restricted transmittances. Here we propose the concept of nonreciprocal encircling of EPs in a dynamic waveguide under complex modulation. The waveguide allows direction-dependent EPs in their quasienergy spectra due to different phase-matching conditions for opposite propagation direction. We design a closed loop that will encircle the EP in the backward direction but not in the forward direction. In this way, a nonreciprocal topological conversion is achieved as the forward transmittance from the even to odd mode significantly exceeds the backward transmittance from the odd to even mode. As a result, the forward propagation produces two modes with equal strength while the backward propagation leads to a specific mode regardless of the input. The structure is promising for making robust optical isolators.
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