Low Size All Optical XOR and NOT Logic Gates Based on Two-Dimensional Photonic Crystals
AbstractThis paper presents a square lattice of two-dimensional photonic crystal in the design of NOT and XOR logic gates. An important characteristic of this method is that the one structure allows implementation of two types of logic gate. The structure consists of two inputs and one output so that whenever it is used as a NOT gate, one of the entrances acts as controller for the input. Plane Wave Expansion (PWE) is used to calculate frequency band structure of the proposed lattice and the Finite Difference Time Domain (FDTD) method is used to calculate the optical power distribution in waveguide paths. The low size and simplicity of the proposed structure are its advantages that makes it suitable for use in optical integrated circuits. Also the optical power transmitted to the output in "0" logic state is very close to zero.
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