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Multi-mode interference-based photonic crystal logic gates with simple structure and improved contrast ratio

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Abstract

We present a MMI-based photonic crystal all-optical logic gate structure for logic functions such as XNOR, XOR, OR and NAND with square-type lattice of Si rods in air host. Phase-based logic inputs produce intensity-based logic outputs with high contrast ratio. The calculated ON to OFF contrast ratio for the logic functions XNOR/XOR and OR/NAND is 40.41 and 37.40 dB, respectively. Further, it is improved by 11.53 and 12.46% for XNOR/XOR and OR/NAND logic functions, respectively, by reducing the back reflection with the introduction of absorbing waveguides. The structure in both the forms has a fast response period that is less than or equal to 0.131 ps. The size of the structure is quite compact with dimension \(6.4\,\upmu \hbox {m} \times 8.8\,\upmu \hbox {m}\).

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Authors and Affiliations

  1. Department of Electronics Engineering, Pondicherry University, Puducherry, 605014, India

    Enaul haq Shaik & Nakkeeran Rangaswamy

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  1. Enaul haq Shaik
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  2. Nakkeeran Rangaswamy
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Correspondence to Enaul haq Shaik.

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Shaik, E.h., Rangaswamy, N. Multi-mode interference-based photonic crystal logic gates with simple structure and improved contrast ratio. Photon Netw Commun 34, 140–148 (2017). https://doi.org/10.1007/s11107-016-0683-7

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