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We present the design, fabrication, and measured performance of metamaterialAnti-Reflection Cuttings (ARCs) for large-format alumina filters operating overmore than an octave of bandwidth to be deployed on the Simons Observatory (SO).The ARC consists of sub-wavelength features diced into the optic's surfaceusing a custom dicing saw with near-micron accuracy. The designs achievepercent-level control over reflections at angles of incidence up to 20$^\circ$.The ARCs were demonstrated on four 42 cm diameter filters covering the 75-170GHz band and a 50 mm diameter prototype covering the 200-300 GHz band. Thereflection and transmission of these samples were measured using a broadbandcoherent source that covers frequencies from 20 GHz to 1.2 THz. Thesemeasurements demonstrate percent-level control over reflectance across thetargeted pass-bands and a rapid reduction in transmission as the wavelengthapproaches the length scale of the metamaterial structure where scatteringdominates the optical response. The latter behavior enables the use of themetamaterial ARC as a scattering filter in this limit.

Simons Observatory: Broadband Metamaterial Anti-Reflection Cuttings for Large Aperture Alumina Optics