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Parity-time symmetric coupled microresonators with a dispersive gain/loss

Phang, Sendy; Vukovic, Ana; Creagh, Stephen C.; Benson, Trevor M.; Sewell, Phillip D.; Gradoni, Gabriele


Professor of Electromagnetic Applications

Trevor M. Benson

Phillip D. Sewell


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, we demonstrate a lasing mode operation which occurs due to an early PT-breaking by increasing loss in a PT system with unbalanced gain and loss.


Phang, S., Vukovic, A., Creagh, S. C., Benson, T. M., Sewell, P. D., & Gradoni, G. (2015). Parity-time symmetric coupled microresonators with a dispersive gain/loss. Optics Express, 23(9), 11493-11507.

Journal Article Type Article
Acceptance Date Mar 15, 2015
Online Publication Date Apr 23, 2015
Publication Date May 4, 2015
Deposit Date Jul 3, 2015
Publicly Available Date Jul 3, 2015
Journal Optics Express
Electronic ISSN 1094-4087
Publisher Optical Society of America
Peer Reviewed Peer Reviewed
Volume 23
Issue 9
Pages 11493-11507
Public URL
Publisher URL
Additional Information © 2015 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.


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