Asymmetrical microring resonator based on whispering gallery modes for the detection of glucose concentration

The optical resonator based on whispering gallery modes (WGMs) was widely studied due to its application potential in many fields. The novel asymmetrical microring resonator was proposed and investigated numerically using finite-difference time-domain (FDTD) method in this paper. The asymmetry of the asymmetrical microring resonator structure was reflected in the material and the structure of the microring resonator. The Q factor of the proposed asymmetrical microring, which was a significant parameter to measure the performance of microresonators, was more than five times of conventional microring resonator while maintaining the same sensitivity. The simulation verified that the structure can be applied to the detection of glucose solution concentration. This provided the potential for high-performance microring resonator to integrate on chip-scale devices for biosensing.