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Title: Simons Observatory: broadband metamaterial antireflection cuttings for large-aperture alumina optics

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/ao.472459· OSTI ID:1881267
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]
  1. Univ. of Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Univ. of Chicago, IL (United States)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
  4. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  5. Univ. of Pennsylvania, Philadelphia, PA (United States)
  6. Tor Vergata Univ. of Rome (Italy)
  7. Cardiff Univ., Wales (United Kingdom)
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
+ Show Author Affiliations

Here we present the design, fabrication, and measured performance of metamaterial antireflection cuttings (ARCs) for large-format alumina filters operating over more than an octave of bandwidth to be deployed at the Simons Observatory (SO). The ARC consists of subwavelength features diced into the optic’s surface using a custom dicing saw with near-micrometer accuracy. The designs achieve percent-level control over reflections at angles of incidence up to 20°. The ARCs were demonstrated on four 42 cm diameter filters covering the 75 to 170 GHz band and a 50 mm diameter prototype covering the 200 to 300 GHz band. The reflection and transmission of these samples were measured using a broadband coherent source that covers frequencies from 20 GHz to 1.2 THz. These measurements demonstrate percent-level control over reflectance across the targeted pass-bands and a rapid reduction in transmission as the wavelength approaches the length scale of the metamaterial structure where scattering dominates the optical response. The latter behavior enables use of the metamaterial ARC as a scattering filter in this limit.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Simons Foundation; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11359; 457687; 80NSSC21K0411; 1746045
OSTI ID:
1881267
Report Number(s):
FERMILAB-PUB-22-569-PPD-V; arXiv:2208.02292; oai:inspirehep.net:2134146; TRN: US2307820
Journal Information:
Applied Optics, Vol. 61, Issue 30; ISSN 1559-128X
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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