Shitvov, AAShitvovPisano, GGPisanoOLMI, LUCALUCAOLMIBOLLI, PietroPietroBOLLITucker, CCTucker2021-09-032021-09-0320201559-128Xhttp://hdl.handle.net/20.500.12386/31019A 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 superresolution 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 −10 dB. 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.STAMPAenArticle10.1364/AO.4034902-s2.0-85097629859WOS:000595631500013https://www.osapublishing.org/ao/fulltext.cfm?uri=ao-59-34-10729&id=444026FIS/05 - ASTRONOMIA E ASTROFISICA