Broadband coated lens solutions for FIR-mm-wave instruments
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI(2022)
摘要
This paper presents recent results of ongoing European Space Agency funded program of work aimed at developing large dielectric lenses suitable for future satellite missions, with a particular focus on requirements for CMB polarimetry. Two lens solutions are being investigated: (i) polymer lenses with broadband multi-layer antireflection coatings; (ii) silicon lenses with surface-structured anti-reflection coating represented by directly machined pyramidal features. For each solution, base materials with and without coatings have been optically characterized over a range of temperatures down to similar to 10 K. Full lens solutions are under manufacture and will be tested in a bespoke large cryo-optical facility.
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关键词
anti-reflection coating,cosmic microwave background,dielectric characterization,dielectric lens,millimeter-wave astronomy,quasi-optical systems,refracting telescope
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