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Abstract
A novel design of all-optical logic gates is proposed using the 2D square lattice PhC structure built with dielectric rods surrounded by air. The theory of operation to realize the logic gates functionality is based on the optical interference phenomenon, where logic {u2019}1{u2019} corresponds to a constructive in-terference, while the logic {u2019}0{u2019} corresponds to a destructive interference. The proposed logic gates have compact size and exhibit wide range of operating wavelengths between 1266.9 nm and 1996 nm with center operating wave-length 1550 nm to ful{uFB01}ll various requirements of different applications. We used The PWE and FDTD mathematical methods to analyze the signal{u2019}s behavior inside the PhC and to calculate the PBG. The calculated maximum contrast ratio in dB for AND, XOR, NOR, NAND and XNOR is found to have values of 6:02, 12:155, 9:02, 8:58 and 9:59, respectively