Using the long-established Cardiff metal-mesh filter technology, we have exploited our ability to artificially manipulate the phase of a wavefront across a device in order to produce a dielectric-based Toraldo pupil working at millimeter wavelengths. The use of a Toraldo pupil to push the angular resolution of an optical imaging system beyond the classical diffraction limit is yet to be realized in the millimeter regime, but is an exciting prospect. Here we present the design and measured performance of a prototype Toraldo pupil, based on a 5 annuli design.

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Giampaolo Pisano, Alexey Shitvov, Carole Tucker, Daniela Mugnai, Pietro Bolli, Luca Olmi, Francesco D'Agostino, Massimo Migliozzi, Alessandro Orfei, Alessandro Navarrini, Cristiano Riminesi, and Bruno Maffei, "Metamaterial-based Toraldo pupils for super-resolution at millimetre wavelengths," Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107080G (Presented at SPIE Astronomical Telescopes + Instrumentation: June 12, 2018; Published: 9 July 2018); https://doi.org/10.1117/12.2314086.