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Photonic crystals with split ring unit cells for subwavelength light confinement.

Kellen P Arnold, Sami I Halimi, Joshua A Allen

    Optics Letters
    |February 1, 2022
    PubMed
    Summary

    This study introduces a novel split ring photonic crystal that significantly enhances electric field energy density. This photonic crystal offers tunable light confinement for advanced optical applications.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science

    Background:

    • Traditional photonic crystals have limitations in controlling light confinement.
    • Enhancing electric field energy density is crucial for various optical applications.

    Purpose of the Study:

    • To report a novel photonic crystal with a split ring unit cell.
    • To demonstrate significantly enhanced peak electric field energy density compared to traditional designs.
    • To explore the tunability of light confinement using subwavelength parameters.

    Main Methods:

    • Fabrication and characterization of a split ring photonic crystal.
    • Investigation of subwavelength tuning parameters such as split ring rotation angle and split width.
    • Measurement of peak electric field energy density and air band edge wavelength.

    Main Results:

    • The split ring photonic crystal achieves an order of magnitude larger peak electric field energy density.
    • Subwavelength parameters allow for over one order of magnitude tuning of energy density.
    • The air band edge wavelength is tunable by nearly 10 nm in the near-infrared region.

    Conclusions:

    • Split ring photonic crystals offer superior light confinement and energy density.
    • Tunable parameters enable precise control over optical properties for specific applications.
    • The design is suitable for optical biosensing, optical trapping, and enhanced nanoscale emitter performance.