Designing a multichannel nanocavity coupled photonic crystal biosensor for detection of glucose concentration in blood

Abstract

Biosensor is an analytical device used to detect the biological analyte, which can be antibodies enzymes cells or biomolecules. Biosensors have many applications like in environmental monitoring, biomedical research, and healthcare. In this paper we have proposed a multichannel nanocavity coupled photonic crystal biosensor having waveguides and nanocavities in the hexagonal lattice of rods of Si in the air slab. Nanocavity coupled waveguide 2D photonic crystal biosensor which can be able to detect glucose concentration in blood. This structure has a hexagonal symmetry that has area of 19×17μm2. Over the wafer of air dielectric rods of Si are introduced, which has refractive index of 3.6730, lattice constant of 680nm and radius of 200nm. Biosensor can detect glucose concentration in blood with 0mg/dl, 50mg/dl 100mg/dl and 150mg/dl of glucose concentration. Simulation and analysis has been done and peak has been observed. For the analysis, FDTD method is used. A spectral shift has been occurred in transmission spectra due to change in refractive index. With the consideration of different concentration of glucose having different refractive indices, this property is expedient in the sensing application. In this paper design is allowed to operate in the wavelength range of 1300–1700nm.