Parity-Time Symmetric Coupled Microresonators with a Dispersive Gain/Loss
Abstract
The paper reports on the coupling of Parity-Time (PT)-symmetric whispering gallery resonators with realistic material and gain/loss models. Response of the PT system is analyzed for the case of low and high material and gain dispersion, and also for two practical scenarios when the pump frequency is not aligned with the resonant frequency of the desired whispering gallery mode and when there is imbalance in the gain/loss profile. The results show that the presence of dispersion and frequency misalignment causes skewness in frequency bifurcation and significant reduction of the PT breaking point, respectively. Finally, as coupled WGM resonators are inherently lossy structures, we show that unbalancing the gain/loss in resonators is required to compensate for inherent loss of the structure and achieve improved PT properties.
Keywords
Cite
@article{arxiv.1501.07455,
title = {Parity-Time Symmetric Coupled Microresonators with a Dispersive Gain/Loss},
author = {Sendy Phang and Ana Vukovic and Stephen Creagh and Trevor M. Benson and Phillip Sewell and Gabriele Gradoni},
journal= {arXiv preprint arXiv:1501.07455},
year = {2015}
}
Comments
15 pages, 11 figures