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Gallium-diffused waveguides in sapphire.

V Apostolopoulos, L M Hickey, D A Sager

    Optics Letters
    |December 1, 2007
    PubMed
    Summary
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    Researchers fabricated gallium-diffused planar waveguides in sapphire. These waveguides show potential for low-threshold lasers and integrated optical circuits.

    Area of Science:

    • Materials Science
    • Optoelectronics
    • Solid-State Physics

    Background:

    • Sapphire (Al2O3) is a key material for optical applications due to its wide transparency range and high thermal/mechanical stability.
    • Planar waveguides are essential components for integrated optics, enabling light manipulation on a chip.
    • Gallium diffusion is explored as a method to create optical waveguides in dielectric substrates.

    Purpose of the Study:

    • To report the fabrication and characterization of gallium-diffused planar waveguides in sapphire.
    • To investigate the optical properties and guiding capabilities of these novel waveguides.
    • To discuss potential applications in optoelectronics.

    Main Methods:

    • Fabrication of waveguides by diffusing gallium oxide films (60-200 nm) into c-cut sapphire at 1600°C for 6-16 hours.

    Related Experiment Videos

  • Characterization using near-field intensity profiling of guided modes.
  • Measurement of optical properties at wavelengths ranging from 488 nm to 850 nm.

    • Main Results:

    • Successful fabrication of gallium-diffused planar waveguides in sapphire.
    • Measurement of near-field intensity profiles confirming light guiding.
    • Estimation of surface-index elevation up to (0.6 ± 0.02) x 10⁻².
    • Demonstration of waveguiding at visible and near-infrared wavelengths.

    Conclusions:

    • Gallium diffusion is a viable technique for creating planar waveguides in sapphire.
    • These waveguides exhibit promising optical characteristics for integrated photonic devices.
    • Potential applications include low-threshold Ti:sapphire waveguide lasers and optical integrated circuits.