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Optical Absorption in Graphene-on-Silicon Nitride Microring Resonators

Graphene-on-silcon nitride (Si3N4) microring resonators were theoretically optimized and experimentally demonstrated to enhance their absorption. The original absorption of 25 dB/mm in a graphene-on-Si3N4 straight waveguide was significantly enhanced through the resonator structure, offering a quality factor from ~28200 to ~3800 depending on the graphene length in the cavity. The result agrees well with theoretical calculations. The characterization study in this letter is useful in developing graphene-on-Si3N4 microring resonator structure for high-performance optical modulators and photodetectors.