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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 33 — Nov. 20, 2013
  • pp: 8102–8105

Epoxy-based broadband antireflection coating for millimeter-wave optics

Darin Rosen, Aritoki Suzuki, Brian Keating, William Krantz, Adrian T. Lee, Erin Quealy, Paul L. Richards, Praween Siritanasak, and William Walker  »View Author Affiliations


Applied Optics, Vol. 52, Issue 33, pp. 8102-8105 (2013)
http://dx.doi.org/10.1364/AO.52.008102


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Abstract

We have developed epoxy-based, broadband antireflection coatings for millimeter-wave astrophysics experiments with cryogenic optics. By using multiple-layer coatings where each layer steps in dielectric constant, we achieved low reflection over a wide bandwidth. We suppressed the reflection from an alumina disk to 10% over fractional bandwidths of 92% and 104% using two-layer and three-layer coatings, respectively. The dielectric constants of epoxies were tuned between 2.06 and 7.44 by mixing three types of epoxy and doping with strontium titanate powder required for the high dielectric mixtures. At 140 K, the band-integrated absorption loss in the coatings was suppressed to less than 1% for the two-layer coating, and below 10% for the three-layer coating.

© 2013 Optical Society of America

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(310.6860) Thin films : Thin films, optical properties
(350.4010) Other areas of optics : Microwaves
(310.4165) Thin films : Multilayer design

ToC Category:
Thin Films

History
Original Manuscript: July 31, 2013
Revised Manuscript: October 20, 2013
Manuscript Accepted: October 23, 2013
Published: November 18, 2013

Citation
Darin Rosen, Aritoki Suzuki, Brian Keating, William Krantz, Adrian T. Lee, Erin Quealy, Paul L. Richards, Praween Siritanasak, and William Walker, "Epoxy-based broadband antireflection coating for millimeter-wave optics," Appl. Opt. 52, 8102-8105 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-33-8102


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