Ultra Fast Computing Using Photonic Crystal Based Logic Gates

A Novel design of all-optical fundamental NAND and XNOR logic gates based on two dimensional photonic crystals hasbeen presentedin this paper. In a photonic crystal self collimated beams are partially transmitted and partially reflected with a phase lag at line defect in Γ-X direction. By employing a appropriate phase shifter, the reflected and transmitted inputbeams areinterferedconstructivelyor destructively to obtain therequired logic outputs.The operation of the logic gates is simulated using two dimensional Finite Difference Time Domain (FDTD) method.