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

Phang, Sendy and Vukovic, Ana and Creagh, Stephen C. and Benson, Trevor M. and Sewell, Phillip D. and Gradoni, Gabriele (2015) Parity-time symmetric coupled microresonators with a dispersive gain/loss. Optics Express, 23 (9). pp. 11493-11507. ISSN 1094-4087

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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.

Item Type: Article
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.
Schools/Departments: University of Nottingham UK Campus > Faculty of Engineering > Department of Electrical and Electronic Engineering
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Depositing User: Phang, Sendy
Date Deposited: 03 Jul 2015 08:16
Last Modified: 14 Sep 2016 19:47

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