Maryam Sharifi - Faculty of Physics, University of Tabriz, Tabriz, Iran.
Payman Tajalli - Institut für Theoretische Physik, Universität Regensburg, ۹۳۰۴۰۰, Regensburg, Germany.
Hamid Pashaei Adl - Instituto de Ciencia de Materiales (ICMUV), Universidad de Valencia, C/ Catedrático José Beltrán ۲, ۴۶۹۸۰ Paterna, Spain.
Habib Tajalli - Department of Physics, Tabriz Branch Islamic Azad University, Tabriz, Iran.
Habib Tajalli - Biophotonic Research Center, Tabriz Branch Islamic Azad University, Tabriz, Iran.

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 ۵-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 ۲۴۰ nm/RIU.

Biosensor, Photonic Crystals, Topological Edge Modes, Light-Matter interaction, Transfer Matrix Method