Inverse design of exceptional points in a single-resonance two-port network

TL;DR

This paper introduces an inverse-design approach to efficiently locate scattering exceptional points in single-resonance two-port systems, aiding in the tuning of geometric parameters for desired wave control.

Contribution

The authors develop a novel inverse-design method for identifying scattering EPs, applicable to single-mode and potentially multi-mode resonant systems.

Findings

Method successfully locates EPs in simulations and circuit models.

Design guide enables precise tuning of system parameters.

Applicable to a broad class of resonant systems.

Abstract

Exceptional points (EPs) in non-Hermitian photonic systems enable unconventional control of wave amplitude and phase. However, identifying the EPs in multidimensional parameter space of a system can be nontrivial and, in some cases, even infeasible. Here we propose an inverse-design method to efficiently locate the scattering EPs for a two-port resonant system supporting a single mode. The proposed method provides a direct guide for tuning of geometric parameters to realize scattering EPs, as confirmed by both full-wave simulation and equivalent circuit model. In principle, our method is compatible with multi-mode system, making it broadly applicable to a broad class of resonant systems.