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Realization of all-optical NOT and XOR logic gates based on interference effect with high contrast ratio and ultra-compacted size

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In this paper, an ultra-compact structure is presented for realization of all-optical NOT and XOR logic gates which can be compatible with silicon technology. Logic gates are based on two-dimensional photonic crystals, and the lattice constant and the radius of the rods are selected in such a way in order to operate the logic gates at 1550 nm. The proposed structure consists of three waveguides which are connected to each other using a T-shaped junction. This structure is optimized by two nano-resonators and has also two input ports and one output port. For our numerical studies, the plane-wave expansion and finite-difference time-domain methods have been used. The contrast ratios for the proposed all optical NOT and XOR logic gates are respectively 43.40 and 43.38 dB. The response time of the logic gates is 0.37 ps, which in turn creates a data transmission rate of 3.15 Tb/s. Our studies have shown that the NOT-designed logic gate is suitable for the use in optical integrated circuits.

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Correspondence to Mahmood Seifouri.

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Olyaee, S., Seifouri, M., Mohebzadeh-Bahabady, A. et al. Realization of all-optical NOT and XOR logic gates based on interference effect with high contrast ratio and ultra-compacted size. Opt Quant Electron 50, 385 (2018).

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