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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    Researchers reduced side lobe levels in phased arrays by using a Fermat

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    Area of Science:

    • Optics and Photonics
    • Antenna Engineering
    • Wireless Communications

    Background:

    • Phased arrays are crucial for visible and infrared wireless systems, offering enhanced performance for communication, imaging, and sensing.
    • Traditional phased array fabrication leads to significant element separation, causing secondary radiation lobes, crosstalk, and interference.

    Purpose of the Study:

    • To investigate the effectiveness of Fermat's spiral arrangement in reducing side lobe levels (SLL) in phased arrays.
    • To demonstrate a practical method for improving antenna performance in visible and infrared wireless systems.

    Main Methods:

    • Experimental validation of Fermat's spiral array configuration in a CMOS-compatible 8-element phased array.
    • Simulation and experimental demonstration using a spatial light modulator (SLM) for larger 64-element arrays with varied spacing.

    Main Results:

    • A reduction in SLL of 0.9 dB was achieved in the 8-element CMOS-compatible array.
    • A significant SLL drop of 6.9 dB was measured for a 64-element array using SLM.

    Conclusions:

    • The Fermat's spiral arrangement effectively reduces SLL in phased arrays.
    • This method offers a promising solution for applications requiring high antenna gain, minimal power loss, and enhanced information security.