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Ultra-lightweight mirrors with high solar reflectivity and high infrared emissivity for sun-facing radiative thermal management in space

Loke, Samuel and Naqavi, Ali and Warmann, Emily and Espinet-González, Pilar and Vaidya, Nina and Kelzenberg, Michael and Atwater, Harry A. (2022) Ultra-lightweight mirrors with high solar reflectivity and high infrared emissivity for sun-facing radiative thermal management in space. Optics Express, 30 (16). pp. 28268-28278. ISSN 1094-4087. doi:10.1364/oe.454212. https://resolver.caltech.edu/CaltechAUTHORS:20220823-627416700

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Abstract

We report the design, fabrication, and characterization of ultralight coatings that employ Salisbury screen principles and the unique nature of ITO to achieve frequency selective broadband emissivity. Our coating comprises 60 nm SiO2, 10 nm ITO, 2.3 µm NeXolv LaRC CP1 polyimide and 300 nm Ag, and achieves an aerial mass of 4.07 gm-2. It has a calculated and measured visible spectrum reflectivity of R = 0.893 and R = 0.896 respectively when weighted against AM0 from 300 nm to 1800nm; and a calculated and measured IR spectrum emissivity of e = 0.574 and e = 0.554 weighted against a 300 K blackbody respectively. This simple coating design, fabricated on the centimeter scale, achieves broadband frequency selectivity, with the highest reported thermal performance for an ultralight sun-facing radiative energy management structure.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1364/OE.454212DOIArticle
ORCID:
AuthorORCID
Warmann, Emily0000-0002-2810-4608
Espinet-González, Pilar0000-0002-7656-0077
Kelzenberg, Michael0000-0002-6249-2827
Atwater, Harry A.0000-0001-9435-0201
Additional Information:Funding: Space Solar Power Project. The authors wish to acknowledge Tom Tiwald for characterizing the optical properties of polymer CP1 in our previous work.
Group:Space Solar Power Project
Funders:
Funding AgencyGrant Number
Space Solar Power ProjectUNSPECIFIED
Issue or Number:16
DOI:10.1364/oe.454212
Record Number:CaltechAUTHORS:20220823-627416700
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220823-627416700
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116410
Collection:CaltechAUTHORS
Deposited By: Melissa Ray
Deposited On:29 Aug 2022 23:14
Last Modified:29 Aug 2022 23:14

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