Large area W:VO2 metasurface infrared coatings for passive regulation of radiative cooling in space (Conference Presentation)

Otto L. Muskens; Kai Sun; Kees de Groot; Alessandro Urbani; Matteo Gaspari; Sandro Mengali; Ilja Czolkos; Agata Bialy; Giovanni Bartolini; Mostafa Jamalipour; Behcet Alpat

doi:10.1117/12.2634029

3 October 2022 Large area W:VO₂ metasurface infrared coatings for passive regulation of radiative cooling in space (Conference Presentation)

Otto L. Muskens, Kai Sun, Kees de Groot, Alessandro Urbani, Matteo Gaspari, Sandro Mengali, Ilja Czolkos, Agata Bialy, Giovanni Bartolini, Mostafa Jamalipour, Behcet Alpat

Author Affiliations +

Proceedings Volume PC12195, Metamaterials, Metadevices, and Metasystems 2022; PC1219503 (2022) https://doi.org/10.1117/12.2634029
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We present the main results from the Horizon 2020 project Smart-Flex focusing on the development of variable emissivity optical solar reflector foils for radiative cooling in the space environment. The OSR coating is made of two functional blocks, namely a variable emitter topped by a low emissivity solar reflector. The variable emitter is a Perfect Metamaterial Absorber designed for strong and broadband plasmonic resonance absorption in the thermal IR. It consists of a metal back-reflector, a dielectric spacer, and an array of doped Vanadium Dioxide (W:VO2) EM micro-antennas that are switched-off through metal-to-insulator transition when the temperature drops below 10°C. The solar reflector is a wideband dielectric filter of about 30 layers made of materials that are transparent across the entire spectrum from the VIS to the thermal IR. All the layers of the two blocks are deposited by standard vacuum techniques, while the array is patterned by Nano Imprint Lithography (NIL). Our experimental demonstration is fabricated onto a flexible Kapton foil with active metasurface area of 100x100 mm2, which achieves the initial requirements. The devices show a mechanically and thermally robust response which passed some critical ageing tests ageing tests including bending, thermal cycling and charged particle at doses equivalent to 2 years GEO. The presentation focuses on the various developments in materials, fabrication techniques and durability testing.

Conference Presentation

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Otto L. Muskens, Kai Sun, Kees de Groot, Alessandro Urbani, Matteo Gaspari, Sandro Mengali, Ilja Czolkos, Agata Bialy, Giovanni Bartolini, Mostafa Jamalipour, and Behcet Alpat "Large area W:VO₂ metasurface infrared coatings for passive regulation of radiative cooling in space (Conference Presentation)", Proc. SPIE PC12195, Metamaterials, Metadevices, and Metasystems 2022, PC1219503 (3 October 2022); https://doi.org/10.1117/12.2634029

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KEYWORDS

Infrared coatings

Technetium

Absorption

Atomic layer deposition

Deposition processes

Etching

Fabrication

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