硅平台上的紧凑型可调谐电磁诱导透明和法诺共振。

Compact tunable electromagnetically induced transparency and Fano resonance on silicon platform.

作者信息

Zheng Shuang, Ruan Zhengsen, Gao Shengqian, Long Yun, Li Shimao, He Mingbo, Zhou Nan, Du Jing, Shen Li, Cai Xinlun, Wang Jian

出版信息

Opt Express. 2017 Oct 16;25(21):25655-25662. doi: 10.1364/OE.25.025655.

DOI:10.1364/OE.25.025655

PMID:29041230

Abstract

We propose and demonstrate an on-chip coupling resonant system to generate electromagnetically induced transparency (EIT)-like effect and Fano resonance on silicon platform. It is composed of a microring resonator (MRR) and two cascaded Sagnac-loop mirrors (SLMs) assisted Fabry-Perot (FP) cavity on silicon-on-insulator. According to the coupling conditions of the MRR, two cases are studied theoretically. When the MRR is over coupling, EIT-like transmission can be observed. In contrast, Fano resonances can be generated by the condition of under coupling. In the experiment, the add-drop MRR is under coupling, leading to a sharp asymmetric line shape for Fano resonance. The resonance wavelength of the MRR can be dynamically tuned based on thermal-optic effects by tuning the micro-heater. The experiment results show Fano resonances with maximum extinction ratio (ER) of 23.22 dB and maximum slope rate (SR) of 252 dB/nm. Moreover, the wavelength of Fano resonance can be shifted widely with a tuning efficiency of 0.2335 nm/mW.

摘要

我们提出并演示了一种片上耦合谐振系统，以在硅平台上产生类似电磁诱导透明（EIT）的效应和法诺共振。它由一个微环谐振器（MRR）和两个级联的萨格纳克环镜（SLM）辅助的绝缘体上硅法布里-珀罗（FP）腔组成。根据MRR的耦合条件，从理论上研究了两种情况。当MRR过耦合时，可以观察到类似EIT的传输。相反，在欠耦合条件下可以产生法诺共振。在实验中，分插复用MRR处于欠耦合状态，导致法诺共振呈现出尖锐的不对称线形。通过调节微加热器，基于热光效应可以动态调谐MRR的共振波长。实验结果表明，法诺共振的最大消光比（ER）为23.22 dB，最大斜率率（SR）为252 dB/nm。此外，法诺共振的波长可以以0.2335 nm/mW的调谐效率进行大幅移动。