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Characterization method of a mid-infrared graphene-on-silicon microring with a monochromatic laser

Mid-infrared microring resonators have been extensively studied for biochemical sensing applications. To characterize such resonators, a tunable laser or spectrometer has usually been utilized in previous studies. However, it is challenging to integrate these bulky instruments on a chip, ineluctably limiting practical applications. Here, we study a method for characterizing a microring resonator by using a monochromatic laser to conquer this limitation. Specifically, we theoretically probe the quality factor, extinction ratio, and resonant wavelength shift of a graphene-on-silicon microring resonator at a wavelength of 2.7 µm. Our work paves the way for studying monochromatically chip-integrated cavities and their applications.