Abstract

We theoretically investigate a controllable dual-frequency unidirectional reflectionlessness at exceptional points by applying external voltage in a graphene plasmonic waveguide system. The system consists of a graphene waveguide and two end-coupled resonators. COMSOL simulation results show that the reflection of edge fundamental graphene surface plasmon polaritons mode for forward (backward) incidence is near to zero at frequency 24.418 THz (20.865 THz), while that for backward (forward) incidence is 24.71% (22.945%), respectively. In addition, the non-Hermitian scattering matrix is proposed to verify the existence of double exceptional points, and the tunable unidirectional reflectionless phenomenon is also achieved by changing the Fermi level (${E_f}$) of graphene.

© 2021 Optical Society of America

Dual-band unidirectional reflectionless phenomena in an ultracompact non-Hermitian plasmonic waveguide system based on near-field coupling

Cong Zhang, Ruiping Bai, Xintong Gu, Xing Ri Jin, Ying Qiao Zhang, and YoungPak Lee
Opt. Express 25(20) 24281-24289 (2017)

Unidirectional reflectionless propagation in plasmonic waveguide-cavity systems at exceptional points

Yin Huang, Georgios Veronis, and Changjun Min
Opt. Express 23(23) 29882-29895 (2015)

Unidirectional reflectionless phenomena in a non-Hermitian quantum system of quantum dots coupled to a plasmonic waveguide

Nan Wu, Cong Zhang, Xing Ri Jin, Ying Qiao Zhang, and YoungPak Lee
Opt. Express 26(4) 3839-3849 (2018)

Theoretical investigation of a controlled unidirectional reflectionlessness by applying external voltage in an electro-optical plasmonic waveguide system

Lingxue Yu, Hang Yang, Ying Ming Liu, Chengshou An, Xing Ri Jin, and Ying Qiao Zhang
Opt. Express 28(16) 24069-24078 (2020)

Analytical investigation of unidirectional reflectionless phenomenon near the exceptional points in graphene plasmonic system

Ze-Tong Li, Xin Li, Gui-Dong Liu, Ling-Ling Wang, and Qi Lin
Opt. Express 31(19) 30458-30469 (2023)