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Reflective Toraldo pupil for high-resolution millimeter-wave astronomy.

Alexey Shitvov, Giampaolo Pisano, Luca Olmi

    Applied Optics
    |December 28, 2020
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    Summary
    This summary is machine-generated.

    Researchers developed a novel reflective beam-shaping surface for millimeter-wave astronomy. This device reduces beam width and sidelobe levels, enhancing astronomical observations.

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    Area of Science:

    • Astronomy and Astrophysics
    • Optics and Photonics
    • Electromagnetics

    Background:

    • High-resolution astronomical instruments require precise control over electromagnetic wave propagation.
    • Millimeter/submillimeter-wave astronomy benefits from advanced beam-shaping technologies to improve observational capabilities.
    • Existing reflective optics may have limitations in achieving desired beam characteristics at these frequencies.

    Purpose of the Study:

    • To present a novel beam-shaping reflective surface for high-resolution millimeter/submillimeter-wave astronomy.
    • To demonstrate the application of Toraldo's super-resolution principle in a practical optical device.
    • To enable the transformation of Gaussian beams into flat-top beams with suppressed sidelobes.

    Main Methods:

    • Design based on Toraldo's super-resolution principle.
    • Implementation using an annulated binary-phase coronae structure.
    • Fabrication of a reflective Toraldo pupil device using mesh-filter technology for W-band operation.

    Main Results:

    • The fabricated device successfully reduced beam width upon reflection at oblique incidence.
    • A sidelobe level lower than -10 dB was achieved.
    • The device operates effectively in the W-band and is less than half a free-space wavelength thick.

    Conclusions:

    • The novel reflective Toraldo pupil is a viable solution for beam shaping in millimeter/submillimeter-wave astronomy.
    • The design is scalable to higher frequency bands, including infrared.
    • This technology can transform Gaussian beams into flat-top beams with significantly reduced sidelobes, improving instrument performance.