Enhanced response of non-Hermitian photonic systems near exceptional points

Abstract

This paper theoretically and numerically studies the response characteristics of non-Hermitian resonant photonic systems operating near an exceptional point (EP), where two resonant eigenmodes coalesce. It is shown that a system near an EP can exhibit a non-Lorentzian frequency response, whose line shape and intensity strongly depend on the modal decay rate and coupling parameters for the input waves, unlike a normal Lorentzian response around a single resonance. In particular, it is shown that the peak intensity of the frequency response is inversely proportional to the fourth power of the modal decay rate and can be significantly enhanced with the aid of optical gain. The theoretical results are numerically verified by a full wave simulation of a microring cavity with gain. In addition, the effects of the nonlinear gain saturation and spontaneous emission are discussed. The response enhancement and its parametric dependence may be useful for designing and controlling the excitation of eigenmodes by external fields.

9 pages, 8 figures

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Cited by in corpus (7)

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• Quasinormal modes and Purcell factors of coupled loss-gain resonators and index-modulated ring resonators near exceptional points
• Linear response theory of open systems with exceptional points
• Response strengths of open systems at exceptional points
• Static synthetic gauge field control of double optomechanically induced transparency in a closed-contour interaction scheme
• How to Synthesize Exceptional Points with Three Resonators
• Distance between exceptional points and diabolic points and its implication for the response strength of non-Hermitian systems