Design and analysis of high-performance cascaded microring resonator and highly sensitive temperature sensor using photonic crystal–based topological edge state

Photonic crystals–based cascaded microring resonator structure is proposed to improve the performance using the concept of two-dimensional constrained topological edge states. The topological edge state is created when two microring resonators with distinct band topologies meet an interface and are contained inside a slab of dielectric material which results in a sharp increase in quality factor. The suggested results of the proposed structure were accepted for sensing application, as demonstrated here for temperature sensing. The estimated sensitivity, with a very high-quality factor of 2516, is 3.79 nm/°C.