Nanocavity coupled waveguide photonic crystal biosensor for detection of different blood components

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 nano-cavity coupled waveguide 2D photonic crystal biosensor which can be able to detect different blood components. This structure has a hexagonal symmetry that has area of 19×15μm2. Over the wafer of air dielectric rods of Si are introduced, which has refractive index of 3.6730, lattice constant of 690nm and radius of 220nm. Biosensor can detect Acetone, Tocopherol, Blood plasma, Cytop, Ethanol, Sylgard184, and Water. 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 components 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 1500–1700nm.