Design of a High Q-factor Label-Free Optical Sensor Based on Photonic Crystal CoupledCavity Waveguide for Biosensing Applications

Description

In recent years, there has been a significant increase in research into silicon-based on-chip sensing. In this paper, a coupled cavity waveguide (CCW) based on a slab photonic crystal structure is designed for use as a label-free biosensor. The photonic crystal consists of holes in a triangular lattice. The incorporation of holes into photonic crystals has led to the development of a sensor that is highly sensitive to even slight alterations in refractive index with a small quantity of analyte. The plane wave expansion method (PWE) was used to study the dispersion and profile of the CCW modes and the finite-difference time-domain (FDTD) technique was used to study the transmission spectrum, the quality factor, and sensitivity. We present an analysis of adiabatic coupling light into a coupled-cavity waveguide. The results of the simulation indicated that a sensitivity of 203 nm/RIU and a quality factor of 13360 could be achieved when the refractive indices were in the range of 1.33 to 1.55.

Period	20 Sept 2022
Event title	MNE/Eurosensors 2022
Event type	Conference
Location	BelgiumShow on map