A compact low-loss one-way transmission structure based on nonreciprocal coupling

Abstract

Based on Magnetic Plasmon States and the coupling effect, a compact low-loss one-way transmission structure is proposed. The structure is composed of a two-way transmission line channel and a one-way ferrite loop channel. The length of the structure has an inverse relationship with working frequency. By applying a static bias magnetic field, One-Way Edge States of ferrite on the surface of the loop are excited, which results in the unidirectional coupling between the two channels. Excellent forward transmission efficiency can be achieved due to the cutoff of the forward coupling. On the other hand, the good coupling of the reversed transmission ensures good isolation between the two ports of the two-way channel. To validate the design, a prototype has been fabricated and measured. Both the simulation and experiment results verify the low-loss one-way transmission property.

Design and verification of a broadband highly-efficient plasmonic circulator*

“…[13] Most of the circulator designs achieve one-way transmission by applying an external magnetic field to the gyroelectric or gyromagnetic material to break the symmetry of the permittivity or permeability tensor. [14][15][16][17][18][19] Non-magnetic material is also used to design circulators without using a magnetic field bias to break reciprocity. [20,21] These designs open up a way to design nonreciprocal devices based on different mechanisms.…”

Unidirectional and robust propagating surface magnetoplasmon in magneto-optical coaxial waveguides

“…Based on one-way SMPs, many potential applications have been proposed theoretically and experimentally, such as waveguides, isolators and power splitters. [20][21][22][23][24][25] However, most theoretical research focuses on two-dimensional structures, ignoring the effects of the third dimension on electromagnetic propagation modes. This leads to a deviation between theoretical analyzes and actual results.…”