Dynamically controllable graphene three-port circulator

TL;DR

This paper proposes a novel graphene-based three-port circulator with tunable isolation and low insertion loss, suitable for terahertz applications, demonstrated through numerical simulations of its electromagnetic performance.

Contribution

It introduces a new graphene three-port circulator design with dynamic control capabilities and analyzes its performance at terahertz frequencies.

Findings

Isolation of -15 dB achieved

Insertion loss of -2 dB demonstrated

Operates effectively within a 6.98% bandwidth at 8.23 THz

Abstract

A new type of the graphene-based three-port circulator is suggested and analysed. The cross-section of the component presents a three-layer structure consisting of a layer of silicon, of silica and of graphene. In-plane figure resembles a common microwave nanostrip circulator with a circular graphene resonator and three waveguides symmetrically connected to it. The graphene is magnetized normally to its plane by a DC magnetic field. The numerical simulation demonstrates the isolation of -15 dB and insertion losses of -2 dB in 6.98 \% frequency band with the central frequency 8.23THz.