▎ 摘　　要

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 similar to 28 200 to similar 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.