Design of high sensitivity and high FoM refractive index biosensor based on 2D-photonic crystal

Abstract

This paper aims at proposing a new designbased on the refractive index using 2D photonic crystals(PCs) for diagnosing basal cell carcinoma (BCC). Thisproject consists of a square array of GaAs rods in SiO2.This structure has two inlet and outlet waveguides and amicro-cavity. Waveguides are employed to couple lightto the cavity, and the cavity to inject analyte into it. SomePC rods were used to separate the cavity from the inletand outlet waveguides. The results show that by injectingan analyte into the cavity and changing its refractiveindex, a shift occurs in the resonance wavelength of thetransmission spectrum. The high sensitivity coefficientobtained for this sensor is 730 nm/RIU and its highFigure of Merit (FoM) is 11428. For numerical analysisof the transmission spectrum, Q-factor, and sensorsensitivity, the finite-difference time-domain (FDTD)method was used. High simplicity, sensitivity, FoM makeit suitable for biosensing applications.

Keywords

• basel cell detection biosensor
• finite-difference time-domain
• high figure of merit biosensor
• high sensitivity biosensor
• label free photonic crystal biosensor
• refractive index sensor