QNMnonreciprocal_resonators: an openly available toolbox for computing the QuasiNormal Modes of nonreciprocal resonators

TL;DR

This paper introduces QNMnonreciprocal_resonators, an open-source toolbox extending the QNMEig solver, enabling computation and normalization of electromagnetic quasi-normal modes in nonreciprocal resonators with practical modeling guidance.

Contribution

It provides a comprehensive theoretical and practical framework for computing QNMs of nonreciprocal resonators, including a detailed COMSOL model for implementation.

Findings

Provides a theoretical background on nonreciprocal QNMs.

Includes a practical COMSOL model example.

Facilitates modification for various resonator geometries.

Abstract

QNMnonreciprocal_resonators is an extension (posted in 2021) of the QNMEig solver of the freeware package MAN. It provides a comprehensive presentation of the computation and normalization of electromagnetic quasinormal modes (QNMs) of resonators composed of nonreciprocal materials. It features a theoretical background on the topic and a COMSOL model that illustrates how to put into practice the theory on the example of a Yttrium iron garnet wire in a homogenous background. This document provides the necessary details on how the model is built so that the interested readers may easily modify it for computing QNMs of other nonreciprocal resonators.