Design and Analysis of a Double D-Shaped Dual-Core PCF Sensor for Detecting Biomolecules in the Human Body

This paper proposes a double D-shaped dual core biosensor based on photonic crystal fiber (PCF) and broadly studied for finding of composition of blood like white blood cells (WBCs), hemoglobin (HB), red blood cells (RBCs), plasma and water. Finite Element method (FEM) and commercially available COMSOL Multi-Physics software is used for simulation and quantitatively measurement for proposed PCF biosensor. In this biosensor two independent waveguide formed due to middle circular hole because of two solid cores. Every composition of blood has different refractive index (RI) which is key parameter for sensing performance of biosensor. In this PCF middle small circular hole behaves as sensing channel on which different component of blood is placed. As a result, it is observed that there is shift in peak wavelength because of different RI of blood samples in the transmission curve due to mode coupling theory. Maximum wavelength sensitivity calculated in x-polarized is 6500 nm/RIU and y-polarized is 7500 nm/RIU for RBC-HB. Maximum allowable detection limit is 0.02. The suggested PCF biosensor will therefore study the wide range of medical diagnostics. So, it is concluded that the suggested biosensor will perform perfectly when it comes to detecting blood component.