designing real-time biosensors and chemical sensors based ‎on topological photonic crystal heterostructures

In this paper, we introduce and analytically demonstrate a novel biosensor based on the light-‎matter interaction in a classic topological photonic crystal (pc) heterostructure, which ‎consists of two opposite-facing 5-period pcs separated by a microfluidic channel. because of ‎the excitation of topological edge mode (tem) at the interface of the two pcs, the strong ‎coupling between incident light and tem produces a high-quality resonance peak, which can ‎be used to detect very small changes in the refractive index of biomaterials such as jurkat cells ‎inside the microfluidic channel. the proposed biosensor has a sensitivity of 240 nm /riu.‎