Exceptional Point modulated by Kerr effect in Anti-Parity-Time Symmetry System

TL;DR

This paper proposes a method to control exceptional points in anti-parity-time symmetric systems using Kerr effects, enhancing their practical applicability by manipulating frequency splitting and response to perturbations.

Contribution

It introduces a scheme to modulate exceptional points in APT systems via Kerr effects, overcoming strict operational constraints for better device fabrication.

Findings

Kerr effect can manipulate EPs in APT systems.

Self-phase modulation impedes frequency splitting.

Cross-phase modulation enhances response to perturbations.

Abstract

With respect to parity-time (PT) symmetry, anti-parity-time (APT) symmetric system exhibits much easier readout mechanism due to its real frequency splitting. Generally, such systems need to be operated at exceptional points (EPs) to obtain the best performance. However, strict conditons to locate APT symmetric systems at their EPs precisely put restraints on their practical applications. To overcome this problem, we propose a scheme to manipulate the EPs in APT symmetric configuration by Kerr effect. It is demonstrated that operating EPs by self-phase modulation alone will impede the frequency splitting caused by external perturbations, while cross-phase modulation can enhance the response to measurable perturbations. We also investigate the thermal effect induced by high light intensity, which could reduce the power to manipulate EPs. This proposed scheme can pave a new way in fabricating devices based on APT symmetry.