Optical NOR Logic Gate Design on Square Lattice Photonic Crystal Platform

We numerically demonstrate a new configuration of all-optical NOR logic gate with square lattice photonic crystal (PhC) waveguide using finite difference time domain (FDTD) method. The logic operations are based on interference effect of optical waves. We have determined the operating frequency range by calculating the band structure for a perfectly periodic PhC using plane wave expansion (PWE) method. Response time of this logic gate is 1.98 ps and it can be operated with speed about 513 Ga/s. The proposed device consists of four linear waveguides and a square ring resonator waveguides on PhC platform.