title: Graphene plasmons isolator based on non-reciprocal coupling.
abstract: In this paper we propose a graphene plasmons isolator based on non-reciprocal coupling within double graphene layer waveguide structure on a magneto-optical substrate. The difference in modal indices of graphene plasmons in opposite directions enables non-reciprocal coupling, which is theoretically investigated via coupled mode theory (CMT) and shows good agreement with numerical finite elements methods (FEM). The non-reciprocal coupling endows such system functionalities as magnetically controlled "plasmons circulator" or "plasmons isolator". For the latter case, systematical investigations of the insertion losses and isolation ratios with respect to the structural parameters, material properties, environmental parameters, fabrication errors as well as dielectric damping are presented. Theoretical investigation has shown an isolation ratio as 42 dB. The proposed plasmons circulator and isolator may serve as potential building blocks in graphene plasmons circuits.
authors.forename: Bofeng
authors.initials: B
authors.lastname: Zhu
authors.forename: Guobin
authors.initials: G
authors.lastname: Ren
authors.forename: Yixiao
authors.initials: Y
authors.lastname: Gao
authors.forename: Beilei
authors.initials: B
authors.lastname: Wu
authors.forename: Qiaoyi
authors.initials: Q
authors.lastname: Wang
authors.forename: Chenglong
authors.initials: C
authors.lastname: Wan
authors.forename: Shuisheng
authors.initials: S
authors.lastname: Jian