▎ 摘　　要

Recent advances in photonic devices lead researches to be interested in designing all-optical biosensors as new alternatives to large laboratories. In this work, a two- dimensional photonic crystal biosensor based on Graphene Oxide (GO) is developed. The biosensing mechanism is based on the resonance wavelength shift due to refractive index changes of different blood components. The PhC waveguide is designed with an X-shape ring resonator and a hexagonal lattice of (GO) rods in the air background. In the proposed structure, the array of dielectric rods are with a total size of 21.4mm x16.5 mm. For the optimized structure, the best calculated values of sensitivity (S), quality factor (Q), full width half maximum (FWHM), figure of merit (FOM), and transmission efficiency (TE) are 375 nm/RIU, 14665.8, 0.14nm, 2500 RIU-1, and 99.8% respectively. The important features of this biosensor are excellent FOM, acceptable sensitivity, and high transmission efficiency compared to other studies.