Optical Microring-Based Interrogation Method for Phase Detecting Elements

A novel biochemical sensing method is presented, relying on an optical microring resonator (MRR). The corresponding interrogation procedure based on the above method is suitable for highly sensitive optical phase detection. The proposed principle is related to the interaction of two optical inputs to the micro ring, which have a phase mismatch due to a biochemical event. This mismatch creates asymmetric and shifted mode resonances (Fano resonances) inside the microcavity, extending the finesse of the system. So as to evaluate the proposed scheme, a transfer matrix and a numerical model have been utilized. In order to detect the agent, a separate element is utilized which can be realized as a silicon waveguide monolithically integrated with the related components.