Shitvov, Alexey, Pisano, Giampaolo  ORCID: https://orcid.org/0000-0003-4302-5681, Olmi, Luca, Bolli, Pietro and Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918
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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Abstract
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: | 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: | 24 Oct 2025 21:41 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/136707 |
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