Broadband unidirectional electromagnetic mode at interface of anti-parallel magnetized media

Abstract

We report a kind of broadband electromagnetic boundary mode at an interface of anti-parallel magnetized media, which can only propagate in one direction perpendicular to the magnetization and parallel to the interface. The unidirectionality of this mode originates from the permeability or permittivity tensor introduced by magnetization. We theoretically and numerically analyze the existence of the unidirectional mode, and point out that this mode can exist in both gyromagnetic and gyroelectric medium. We also propose a one-way waveguide based on this unidirectional mode, which may realize a new kind of electromagnetic isolation differing from those existing ones.

Sharp Bend With High Transmission at Microwave Frequencies by Nonreciprocal Magnetic Domain Wall Waveguide

“…Recently, we reported unidirectional guided mode alone NMDW in microwave regime [15], which is similar with the confined unidirectional mode along NMDW in optical regime reported in Ref. [12].…”

One-way optical tunneling induced by nonreciprocal dispersion of Tamm states in magnetophotonic crystals

“…Subsequently, experimental realizations and observations of such EM one-way edge states in different MPCs were reported by Wang et al [11] and Poo et al [12], respectively. Many other studies on nonreciprocal SWs [13][14][15][16][17][18][19], i.e., the existence of one-way SPP modes formed at the interface between a metal and a PC (or vacuum) [13], or nonreciprocal spoof SPPs supported by a structured conductor embedded in an asymmetric magneto-optical medium [14], are also demonstrated by several groups.…”

Magnetically Tunable Unidirectional Electromagnetic Devices Based on Magnetic Surface Plasmon

“…Because of the existence of the PBGs around the MSP resonance, the EM wave can be confined between two MM slabs and transported only in the channel, similar to the conventional photonic crystal waveguide. If two MM slabs have the opposite magnetization, then the EM wave reflected forward from one MM slab will also be reflected forward from the other, leading to the design of an OEMW different from those proposed recently He et al, 2010;Huang & Jiang, 2009;Wang et al, 2008;Yu et al, 2008;Zhu & Jiang, 2010). The performance of the OEMW is illustrated in Fig.…”