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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fan-beam steering device using a photonic crystal slow-light waveguide with surface diffraction grating.

Keisuke Kondo, Tomoki Tatebe, Shoji Hachuda

    Optics Letters
    |December 8, 2017
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    Summary
    This summary is machine-generated.

    This study presents a novel silicon photonic crystal waveguide for non-mechanical beam steering. The device achieves a wide steering range and high resolution, ideal for light detection and ranging applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Non-mechanical beam steering is crucial for various applications, including light detection and ranging (LiDAR).
    • Existing methods often face limitations in terms of size, efficiency, or beam quality.

    Purpose of the Study:

    • To develop a compact, non-mechanical beam steering device using silicon photonics.
    • To enhance steering range and resolution without compromising beam quality.

    Main Methods:

    • Utilized a silicon (Si) photonic crystal slow-light waveguide integrated with a diffraction grating.
    • Employed wavelength sweeping to steer a fan beam radiated into free space.

    Main Results:

    • Achieved a 23° steering range with a 600 μm device.
    • Observed a beam divergence of 0.23°, yielding 100 resolution points.
    • Demonstrated that slow light enhances steering range and maintains beam quality.

    Conclusions:

    • The developed Si photonic crystal waveguide offers a promising solution for compact, high-performance non-mechanical beam steering.
    • The use of slow light in photonic crystals significantly improves steering capabilities for advanced optical systems.