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Designing low power and high contrast ratio all-optical NOT logic gate for using in optical integrated circuits

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In this paper, a new design of all-optical NOT logic gate is proposed. In this structure, a photonic crystal nano-resonator and three waveguides are used. The nano-resonator is formed by removing two dielectric rods. The contrast ratio for the proposed NOT logic gate is 20.75 dB. The maximum response time and the rate of sending information equal to 0.466 ps and 2.145 Tbit/s, respectively. In addition, very low power consumption, small size, and simple design are the main features of this logic gate. These features allow the designed structure to be used in all-optical switches. To accomplish this, two types of logic gates placement alongside each other in the optical integrated circuits are proposed and investigated. In both types, the logic gates are tested for single use and simultaneous use, and the accuracy of the performance and effect of each on the other is measured. The results clearly show that the two logic gates, along with each other, have acceptable performance and can easily be used in the optical integrated circuit.

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Optical integrated circuits


Logic gate


Photonic crystal


Response time


Logical level one


Logical level zero


Ring resonator




Contrast ratio


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Authors’ contributions

AM-B designed and performed simulations, analyzed data and finally drafted the manuscript. SO edited and prepared the finally drafted the manuscript. All authors read and approved the final manuscript.

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Correspondence to Saeed Olyaee.

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Mohebzadeh-Bahabady, A., Olyaee, S. Designing low power and high contrast ratio all-optical NOT logic gate for using in optical integrated circuits. Opt Quant Electron 51, 3 (2019).

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