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Evanescent field-modulated non-uniform optical phased array with large lateral steering angle.

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    This study introduces a novel optical phased array (OPA) design by integrating evanescent field-modulated gratings with non-uniform sparse arrays. This innovative approach achieves a wide field of view (FOV) and narrow beam width for advanced optical systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Antenna Design
    • Array Antennas

    Background:

    • Evanescent field-modulated gratings enhance waveguide transmission but increase antenna size, limiting field of view (FOV).
    • Separated radiating elements in gratings restrict spacing between adjacent antennas, hindering wider FOV applications.

    Purpose of the Study:

    • To overcome the FOV limitations of evanescent field-modulated gratings.
    • To develop a novel optical phased array (OPA) design with a wide FOV and narrow beam width.
    • To integrate evanescent field-modulated gratings with non-uniform sparse arrays for improved antenna performance.

    Main Methods:

    • Combining evanescent field-modulated gratings with non-uniform sparse arrays.
    • Designing antenna elements to accommodate evanescent field-modulated gratings while maintaining large center spacing.
    • Simulating and analyzing the steering range and beam width of the proposed OPA design.

    Main Results:

    • Achieved a wide steering range of 120°×7.18°.
    • Obtained a narrow beam width of 1.33°×0.081°.
    • Maintained large average center spacing, enabling integration of evanescent field-modulated gratings.

    Conclusions:

    • The proposed integrated design offers a promising solution for optical phased arrays (OPAs) with wide fields of view.
    • This approach effectively addresses the trade-off between antenna size and FOV in grating-based optical systems.
    • The developed OPA demonstrates potential for applications requiring high-resolution beam steering over a broad angular range.