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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Photonic-crystal-based all-optical NOT logic gate.

Brahm Raj Singh, Swati Rawal

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |February 3, 2016
    PubMed
    Summary

    This study demonstrates an optical NOT gate inverter using photonic crystals. The device operates at a telecom wavelength of 1.554 μm, offering a simple design for integrated photonic circuits.

    Area of Science:

    • Photonics
    • Optical Computing
    • Materials Science

    Background:

    • Photonic crystals offer unique light manipulation properties.
    • Optical logic gates are crucial for high-speed information processing.
    • Implementing reliable optical inverters is a key challenge in integrated photonics.

    Purpose of the Study:

    • To design and analyze an optical NOT gate inverter using photonic crystals.
    • To investigate the performance of the proposed structure at telecom wavelengths.
    • To assess the feasibility of the device for photonic integrated circuits.

    Main Methods:

    • Utilized hexagonal arrangement of silicon rods in air for photonic crystal design.
    • Leveraged photonic bandgap and guided modes in defect waveguides for logic function.

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  • Employed plane wave expansion method for dispersion curves and finite element method for transmission simulation.

    • Main Results:

    • Maximum output achieved at a telecom wavelength of 1.554 μm.
    • Analysis of transmission, extinction ratio, and tolerance confirmed device functionality.
    • The designed structure exhibits a clear operating principle suitable for optical logic.

    Conclusions:

    • The proposed photonic crystal structure effectively implements an optical NOT gate inverter.
    • The device is suitable for integration into photonic integrated circuits due to its simple design.
    • The findings contribute to the advancement of optical computing and signal processing.