Gao Yun, Zhou Wen, Sun Xiankai, Tsang Hon Ki, Shu Chester
Opt Lett. 2017 May 15;42(10):1950-1953. doi: 10.1364/OL.42.001950.
Cavity-enhanced thermo-optic bistability is studied in a graphene-on-SiN ring resonator. By engineering the coverage of the monolayer graphene on top of the SiN ring resonator, we observed a two-fold enhancement in the thermo-optically induced resonance shift rate and an 18-fold increase in the effective thermal nonlinear refractive index compared with the devices without graphene. The thermo-optic hysteresis loop was also characterized in this hybrid structure, where the experimental results agree well with the theoretical calculations. This Letter paves the way for graphene-on-SiN-based high-speed photodetectors, modulators, and devices for on-chip nonlinear optical applications.
在氮化硅环形谐振器上的石墨烯中研究了腔增强热光双稳性。通过设计单层石墨烯在氮化硅环形谐振器顶部的覆盖度，我们观察到与没有石墨烯的器件相比，热光诱导的共振漂移率提高了两倍，有效热非线性折射率增加了18倍。还对这种混合结构中的热光滞后回线进行了表征，实验结果与理论计算吻合良好。本文为基于氮化硅上石墨烯的高速光电探测器、调制器以及片上非线性光学应用的器件铺平了道路。
