Design of all optical logical OR gate based on 2-D photonic crystal

Abstract

The paper presents the design of all-optical OR gate based on the 2-D photonic crystal. The proposed structure consists of Si rod placed in the air of having the size 15μm×18μm with point and line defects. The Finite difference time domain (FDTD) and plane wave expansion (PWE) methods are used for simulating the structure at 1550 nm wavelength. The forbidden gap of 0.0425 in the range of 0.316417 ≤ (1/λ) ≤ 0.358938 has been obtained for Transverse Magnetic (TM) mode. The obtained contrast ratio is 10dB for this design which makes it advantageous as a basic component for the design of high-speed optical communication devices.