论文标题

微孔谐振器中光的相干虚拟吸收

Coherent virtual absorption of light in microring resonators

论文作者

Zhong, Q., Simonson, L., Kottos, T., El-Ganainy, R.

论文摘要

线性相互光子谐振器的光捕获和辐射过程是光学科学和工程的基本过程之一。最近,针对平面和圆柱光学结构引入并研究了光的相干虚拟吸收(CVA)的概念。 CVA的关键特征是,通过工程化激发波形的时间依赖性,可以将所有输入能量暂时存储到光学结构中而不会泄漏而不会。在这里,我们进一步探讨了由微孔谐振器制成的集成光子设置中的这个新颖概念。通过使用耦合模式理论(CMT),我们在此平台中得出了CVA的分析表达式。反过来,这使我们能够与连贯的完美吸收(CPA)的概念建立联系,并将分析扩展到主动谐振器(具有光学增益)。接下来,我们通过使用由级联梁拆分器制成的简单模型来提供对此过程的物理见解。重要的是,我们使用对现实材料系统的全波分析确认了结果。最后,我们讨论了由于波形不匹配和非线性效应而导致的CVA过程的局限性。

Light trapping and radiation process from linear reciprocal photonic resonators is one of the fundamental processes in optical science and engineering. Recently, the concept of coherent virtual absorption (CVA) of light was introduced and investigated for planar and cylindrical optical structures. The key feature of CVA is that by engineering the time-dependence of the excitation waveform, one can temporarily store all the input energy into the optical structure without any leakage. Here we further explore this novel concept in integrated photonic setups made of microring resonators. By using coupled-mode theory (CMT), we derive an analytical expression for CVA in this platform. This in turn allows us to make the connection with the notion of coherent perfect absorption (CPA) as well as extending our analysis to active resonators (having optical gain). We next provide a physical insight into this process by using a simple model made of cascaded beam splitters. Importantly, we confirm our results using a full-wave analysis of realistic material systems. Finally, we discuss the limitation on the CVA process due to waveform mismatch and nonlinear effects.

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