Realization of Ultra-Compact All-Optical Logic AND Gate Based on Photonic Crystal Waveguide

In this article, we have proposed a design of all-optical logic AND gate in the two-dimensional photonic crystal of triangular lattice structure with silicon rods in air background medium. Introducing line defect in the crystal, a Y-shaped waveguide is created and no nonlinear material is used to construct the device. The radiuses of few rods at the junction area are optimized to realize the operation of logic AND gate. The size of the proposed device is very small with a dimension of 77 μm2 and it provides a contrast ratio of 6.9 dB. It offers a response time of 0.193 picoseconds and a data rate of 2.8 Tbit/second. Plane wave expansion method and finite difference time domain method have been applied to calculate the band structure and to analyze the performance of the simulation, respectively.