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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Cylindrical-lens-embedded photonic crystal based on self-collimation.

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    Optics Express
    |March 18, 2022
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    Researchers engineered photonic crystals to independently control optical power flow and field phase. This self-collimating lattice with a cylindrical lens focuses light, acting as a thin lens despite its thickness.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Photonic crystals offer unique control over light propagation.
    • Independent control of optical power and phase is a key challenge in photonics.

    Purpose of the Study:

    • To demonstrate independent control of optical power flow and field phase using photonic crystals.
    • To create a self-collimating photonic crystal lattice with an embedded cylindrical lens.

    Main Methods:

    • Fabrication of a photonic crystal in photopolymer using multi-photon lithography.
    • Design of a low-symmetry rod-in-wall unit cell for strong self-collimation.
    • Modulation of wall thickness to engineer a spatially quadratic phase profile.

    Main Results:

    • Achieved strong self-collimation of light around 1550 nm telecom wavelength.
    • Demonstrated independent control over optical power flow and field phase.
    • The device functioned as a thin lens, focusing light upon exiting, despite its thickness.

    Conclusions:

    • Photonic crystals can be engineered for independent control of optical power and phase.
    • Self-collimating lattices with tailored phase profiles can act as effective lenses.
    • This technology has potential applications in optical devices and integrated photonics.