A new kind of unidirectional waveguides

Running around a Gyrotropic Material

“…In a previous work, we have extended the theory of unidirectional surface mode at plane interface to an arbitrary smooth boundary case [12]. So there is no doubt that it works for a cylindrical surface.…”

“…On the other hand, the behavior of TRS-broken is also found interesting in a bulk gyrotropic material [12,13]. It has been shown that surface mode on the interface of anti-parallel magnetized medium can propagate in only one direction.…”

Broadband Unidirectional Electromagnetic Mode along an Arbitrary Surface

“…However, these modes are within the bandgap, which limites the range of working frequency. Recently, a kind of broadband unidirectional boundary mode has been reported [4,5], which exists at a plane interface between two gyrotropic materials when under opposite external magnetic fields. In this paper, we extend this result to an arbitrary boundary shape.…”