Novel All Optic Logic Gates using 2D Photonic Crystal Structure

Abstract

A novel scheme for implementation of all-optical logic gate based on 2D photonic crystal structure has been proposed. The design and simulation of novel all-optical logic gates based on two dimensional photonic crystals are reported in this paper. The proposed PCS is comprised of two-dimensional lattice of air holes in a square Silicon substrate having refractive index of 3.15. The operational wavelength of the input ports is 1.55 μm. Since the structure is a simple geometric in its dimension with clear operating principle, it is potentially applicable for photonic integrated circuits. The logic operations are realized by a control signal and the input signal (s) applied across two adjacent faces, while the output is obtained along one of the remaining face. No control signal is used for AND Gate, However to realize OR, NOT and NOR Gates a control signal is applied at the third face. With same structure one can realize all optic logic gates. The steady state field distributions at different input sates are obtained by FDTD simulation. The results indicate the potential candidature of the photonic crystal for optical digital integrated circuits.