LAUSR

In this paper we used three nonlinear resonant rings inside two dimensional photonic crystals structure for realizing all optical half-adder gate. The nonlinear resonant rings were created by adding some nonlinear rods to the photonic crystal based ring resonator structure. The proposed structure has two input and two output ports. The simulations show that when both input are off, both output ports will be off. When one input is ON, port S will be on and when both inputs are on port C will be on. S and C serve as the sum and carry ports of the optical half-adder structure. The maximum rise and fall times of the proposed structure are about 1.5 and 1 ps.