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Related Experiment Video

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Waveguides in inverted opal photonic crystals.

Virginie Lousse, Shanhui Fan

    Optics Express
    |June 9, 2009
    PubMed
    Summary

    This study explores waveguiding in germanium-coated inverted opal photonic crystals. An air sphere defect guides light efficiently, offering a wide bandwidth for optical applications.

    Area of Science:

    • Materials Science
    • Photonics
    • Condensed Matter Physics

    Background:

    • Photonic crystals offer unique control over light propagation.
    • Inverted opal structures provide a versatile platform for photonic device fabrication.
    • Amorphous germanium coatings enhance optical properties.

    Purpose of the Study:

    • To investigate waveguiding phenomena in germanium-coated inverted opal photonic crystals.
    • To analyze defect modes within the complete photonic bandgap.
    • To identify defect designs suitable for efficient light guiding.

    Main Methods:

    • Utilized the plane-wave expansion method for band structure analysis.
    • Investigated two types of line defects: air cylinders and arrays of air spheres.

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  • Focused on the complete photonic bandgap between the 8th and 9th bands.

    • Main Results:

    • An air cylinder defect introduced numerous surface-dominant defect modes.
    • An array of air spheres defect effectively suppressed surface modes.
    • The air sphere defect sustained two polarization-dependent modes with a bandwidth of 113 nm centered at 1.5 micrometers.

    Conclusions:

    • The air sphere defect in germanium-coated inverted opals is a promising candidate for waveguiding.
    • This defect structure enables efficient light guiding with a significant bandwidth.
    • The findings are relevant for developing novel photonic devices operating at telecommunication wavelengths.