A novel structure for realization of an all-optical, one-bit half-adder based on 2D photonic crystals

Abstract

In this paper, a new structure for realizing a one-bit half-adder is proposed based on 2D photonic crystals. The proposed structure consists of 25 × 20 hexagonal lattice silicon rods in an ambient of air. The main advantages of this structure are a proper distinct space between “0” and “1” logical states of outputs, and smooth and stable outputs for a long time. These advantages are found to eliminate the error in identification of logical states (i.e., 0 and 1) at outputs. Working at a 1550-nm wavelength band (the most commonly used wavelength in optical communication known as third window), the simplicity of its structure and also integrable size has made this structure very efficacious for being realized as an all-optical logic gate.