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In this paper, we propose an all-optical high-speed half adder based onlinear defects in a photonic crystal (PhC) structure composed of silicon rods.The proper design of half adder results in no need to increase the intensity ofthe input optical signal for the appearance of the nonlinear Kerr effect, whichleads to diverting the incoming light toward the desired output. The proposeddevice consists of four optical waveguides and a defect in a square latticePhC. Two famous plane wave expansion and finite difference time domain methodsare used to study and analyze photonic band structure and light propagationinside the PhC, respectively. The presented structure, the ON-OFF contrastratios for Sum and Carry, are 16dB and 14dB, respectively. Our simulationresults reveal the proposed half adder has a maximum delay time of 0.7 ps witha total footprint of 158 um2. Due to very low delay time, high contrast ratio,and small footprint that they are more crucial in modern optoelectronictechnologies, this structure can be used in the next generation of all-opticalhigh-speed central processing units.

A novel design of all-optical half adder using a linear defect in a square lattice rod-based photonic crystal microstructure