Creation of a fast optical Toffoli gate based on photonic crystal nonlinear ring resonators

All-optical reversible logic gates can play crucial roles in the next generation of all-optical computing systems. In this paper, we will propose and design an all-optical Toffoli gate using photonic crystal-based nonlinear ring resonators. The proposed structure has three input and three output ports. There is a one-by-one mapping between the input and output ports; therefore, the proposed structure is a reversible gate with the maximum time delay about 2 ps and suitable for optical communication applications.