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

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, 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.

Citation

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. https://doi.org/10.1364/oe.23.011493

• 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
• DOI: https://doi.org/10.1364/oe.23.011493
• Public URL: http://eprints.nottingham.ac.uk/id/eprint/28721
• Publisher URL: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-9-11493
• 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.