A New Configuration for the Realization of Reconfigurable and Power Efficient All-Optical XOR and NOT Gate

A novel and compact structure for realizing all optical XOR and NOT gate is implemented on a photonic crystal platform with dielectric rods in air substrate. The proposed structure can be reconfigured to obtain both the logic operations without altering the structure parameters. The proposed design consists of square lattice of dielectric rods which provide simplicity and ease of fabrication when compared to triangular lattice. The structure works on the interference phenomena caused by phase shift of the input light signals traversing different path lengths. The structure operates at the telecommunication wavelength of 1550 nm and consumes very low power of 1 μW. The design is analyzed utilizing finite difference time domain (FDTD) technique and the bandgap diagram is explored utilizing plane wave expansion (PWE) method. The proposed structure exhibits several advantages such as reduced power consumption, small footprint of 93.5 μm
²
and simple design. The response time is around 0.4ps that corresponds to a bit rate of 2.5 Tbps.