All optical AND gate based on silicon photonic crystal

All-optical logic AND gate is realized by incorporating an elliptical structure at the Y-junction of two-dimensional photonic crystal waveguides. Principle of operation of the device is based on linear optics and, hence, the device consumes very low power while having very fast response time. The proposed device works in the 1550 nm wavelength band. Additionally, the simplicity of the device structure and also the integrable size makes the device very efficacious for the realization of all-optical logic gate.