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Nanostructured gradient index microaxicons made by a modified stack and draw method.

Adam Filipkowski, Bernard Piechal, Dariusz Pysz

    Optics Letters
    |November 14, 2015
    PubMed
    Summary
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    We developed novel nanostructured gradient index microaxicons for optical fiber integration. These microaxicons create an extended line focus, advancing micro-optics applications.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Microfabrication

    Background:

    • Gradient index (GRIN) optics offer unique light manipulation capabilities.
    • Microaxicons are specialized optical elements for generating Bessel beams or line foci.
    • Integration with optical fibers is crucial for compact and efficient photonic devices.

    Purpose of the Study:

    • To design and fabricate nanostructured gradient index microaxicons.
    • To achieve integration of these microaxicons with optical fibers.
    • To characterize the optical performance of the fabricated microaxicons.

    Main Methods:

    • Design using simulated annealing and effective medium theory.
    • Numerical verification via beam propagation method simulations.
    • Fabrication using a modified stack and draw method.

    Main Results:

    • Successful fabrication and integration of nanostructured gradient index microaxicons with optical fibers.
    • Achieved an extended line focus from 70 to 160 μm.
    • Minimum Full Width at Half Maximum (FWHM) diameter of 8 μm at 90 μm.
    • Observed interference patterns at smaller distances due to refractive index profile.

    Conclusions:

    • The fabricated microaxicons demonstrate effective gradient index properties.
    • The results align well with numerical simulations, validating the design and fabrication process.
    • These microaxicons show potential for applications requiring extended line foci in fiber-integrated systems.