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Cavity-enhanced thermo-optic bistability and hysteresis in a graphene-on-Si<sub>3</sub>N<sub>4</sub> ring resonator.
Optics Letters 2017 May 16
Cavity-enhanced thermo-optic bistability is studied in a graphene-on-Si<sub>3</sub>N<sub>4</sub> ring resonator. By engineering the coverage of the monolayer graphene on top of the Si<sub>3</sub>N<sub>4</sub> 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-Si<sub>3</sub>N<sub>4</sub>-based high-speed photodetectors, modulators, and devices for on-chip nonlinear optical applications.
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