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Suppressing grating lobes of large-aperture optical phased array with circular array design.

Yufang Lei, Lingxuan Zhang, Yulong Xue

    Applied Optics
    |September 14, 2023
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    Summary

    A novel circular optical phased array (OPA) design significantly reduces antenna count for millimeter-sized apertures. This innovation enables wide steering ranges and narrow beam widths, paving the way for commercial OPA applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Antenna Array Design

    Background:

    • Two-dimensional optical phased arrays (2D OPAs) face limitations in steering range, beam width, and antenna count.
    • Existing aperiodic 2D array designs struggle with grating lobe suppression for millimeter-sized apertures.

    Purpose of the Study:

    • To propose a novel circular optical phased array (OPA) design to overcome limitations of traditional 2D OPAs.
    • To reduce antenna count while maintaining wide steering range and narrow beam width.

    Main Methods:

    • Theoretical analysis of grating lobe suppression in a circular OPA.
    • Numerical simulations to validate the design's performance.

    Main Results:

    • The circular OPA design achieves wide steering range and narrow beam width comparable to optimized aperiodic designs.
    • Efficient suppression of grating lobes was demonstrated, enabling larger antenna spacing.
    • The design requires fewer than 100 antennas for millimeter-sized apertures, a significant reduction.

    Conclusions:

    • The proposed circular OPA design offers a substantial reduction in antenna count for millimeter-sized apertures.
    • This design simplifies control complexity and reduces power consumption, facilitating commercialization of OPAs.