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Reflective Toraldo pupil for high-resolution millimeter-wave astronomy

Shitvov, Alexey, Pisano, Giampaolo ORCID:, Olmi, Luca, Bolli, Pietro and Tucker, Carole ORCID: 2020. Reflective Toraldo pupil for high-resolution millimeter-wave astronomy. Applied Optics 59 (34) , pp. 10729-10738. 10.1364/AO.403490

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A novel, to the best of our knowledge, beam-shaping reflective surface for high-resolution millimeter/submillimeter-wave astronomy instruments is presented. The reflector design is based on Toraldo’s super-resolution principle and implemented with annulated binary-phase coronae structure inspired by the achromatic magnetic mirror approach. A thin, less than half a free-space wavelength, reflective Toraldo pupil device operated in the W-band has been fabricated using mesh-filter technology developed at Cardiff University. The device has been characterized on a quasi-optical test bench and demonstrated expected reduction of the beam width upon reflection at oblique incidence, while featuring a sidelobe level lower than −10dB. The proposed reflective Toraldo pupil structure can be easily scaled for upper millimeter and infrared frequency bands as well as designed to transform a Gaussian beam into a flat-top beam with extremely low sidelobe level.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
Publisher: Optical Society of America
ISSN: 1559-128X
Funders: STFC
Date of First Compliant Deposit: 1 December 2020
Date of Acceptance: 16 October 2020
Last Modified: 03 May 2023 02:45

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