Phang Sendy, Vukovic Ana, Creagh Stephen C, Benson Trevor M, Sewell Phillip D, Gradoni Gabriele
Opt Express. 2015 May 4;23(9):11493-507. doi: 10.1364/OE.23.011493.
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.
本文报道了具有实际材料和增益/损耗模型的奇偶时间（PT）对称回音壁谐振器的耦合情况。针对低、高材料及增益色散情况，以及泵浦频率与所需回音壁模式的谐振频率未对齐和增益/损耗分布不平衡这两种实际场景，分析了PT系统的响应。结果表明，色散的存在和频率失准分别导致频率分岔的偏斜和PT相变点的显著降低。最后，我们展示了一种激光模式操作，它是通过在增益和损耗不平衡的PT系统中增加损耗而导致早期PT相变来实现的。
