We realize the unidirectional reflectionless light propagation in metal-insulator-metal plasmonic waveguide side-coupled with two resonators based on bulk Dirac semimetal (BDS). This phenomenon is observed at exceptional points where the parity-time symmetry is broken, and near perfect absorption is obtained. Based on the dynamic tunability of BDS, the ultra-compact structure with adjustable unidirectional reflectionlessness can be achieved due to low scattering loss. Our results show a potential for developing integrated plasmonic devices such as active mid-infrared sensors, diodes, and absorbers.

中文翻译：

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集成体狄拉克半金属波导中异常点附近的高对比度可调单向无反射现象

我们实现了金属-绝缘体-金属等离子体波导中的单向无反射光传播，该波导与两个基于体狄拉克半金属（BDS）的谐振器侧耦合。这种现象在奇偶时间对称性被破坏的特殊点上观察到，并获得近乎完美的吸收。基于BDS的动态可调性，由于散射损耗低，可以实现单向无反射可调的超紧凑结构。我们的结果显示了开发集成等离子体设备的潜力，例如有源中红外传感器、二极管和吸收器。