Fano Lineshape Analysis for Enhanced Microring Resonator Sensing: A Theoretical Study

In conclusion, we have successfully derived the resonance lineshape variation of the MRR structure with MRU using the transfer matrix method. Our established model comprehensively considers the influence of light transmitted in both directions within the structure and the size of the MRU on the resonance lineshape and intensity. This rigorous analysis addresses the limitations of previous theories. Furthermore, we have demonstrated the practical application of Fano lineshape shape in single nanoparticle sensing. We have also elucidated the mechanism of lineshape shifting and splitting caused by nanoparticles from the perspective of coupling. We anticipate that our theoretical work will expand the utilization of microring resonators with MRU structures in the field of sensing. Additionally, we look forward to developing more efficient optic isolators to minimize the impact of potential reflected light on lasers and other on-chip devices.