A plasmonic waveguide end-coupled to two plasmonic cavities in a non-Hermitian quantum system for dual-band unidirectional reflectionlessness

• 作者: Hang Yang Fei Zhao Ling-Xue Yu De-Xiu Qiu Cheng-Shou An Ying-Qiao Zhang Xing-Ri Jin
• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: QUANTUM PHYSICS AND QUANTUM INFORMATION
• 页码范围: 73-77
• 页数: 5页
• 语种: 英文

摘要

We demonstrate the possibility of dual-band unidirectional reflectionlessness in a non-Hermitian quantum system composed of a plasmonic waveguide and two end-coupled plasmonic cavities(PCs).Our scheme exhibits dual-band unidirectional reflectionlessness can be obtained at exceptional points by properly adjusting the coupling strength between two PCs,the ratio of decay rates of two PCs,and the ratio of plasmonic cavity-waveguide coupling strengths.As a valuable feature,the quality factor reaches to～175.4 in forward direction,while the backward quality factor is close to～188.2.