Linear absorption coefficient of in-plane graphene on a silicon microring resonator

摘要

We demonstrate that linear absorption coefficient (LAC) of a graphene-siliconhybrid waveguide (GSHW) is determined by the optical transmission spectra of agraphene coated symmetrically coupled add-drop silicon microring resonator(SC-ADSMR), of which the value is around 0.23 dB/um. In contrast to thetraditional cut-back method, the measured results are not dependent on thecoupling efficiency of the fiber tip and the waveguide. Moreover, precisionevaluation of graphene coated silicon microring resonator (SMR) is crucial forthe optoelectronic devices targeting for compact footprint and low powerconsumption.