Hybrid oxide-chalcogenide thin film cavity for passive thermal adaptive radiation

Raymond Yu; Bo K. Shrewsbury; Claire Wu; Harish Kumarasubramanian; Mythili Surendran; Jayakanth Ravichandran; Michelle L. Povinelli

doi:10.1117/12.3022223

18 June 2024 Hybrid oxide-chalcogenide thin film cavity for passive thermal adaptive radiation

Raymond Yu, Bo K. Shrewsbury, Claire Wu, Harish Kumarasubramanian, Mythili Surendran, Jayakanth Ravichandran, Michelle L. Povinelli

Author Affiliations +

Proceedings Volume 13015, Photosensitive Materials and their Applications III; 130150I (2024) https://doi.org/10.1117/12.3022223
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Low-weight, passive, thermal-adaptive radiation technologies are needed to maintain an operable temperature for spacecraft while they experience various energy fluxes. Vanadium dioxide (VO₂) is a commonly used dynamic response material that can transition from a low emissivity (insulating) state to a high emissivity (radiating) state near room temperature. In this study, we used a thin-film coating with the Fabry-Perot (FP) effect to enhance emissivity contrast (Δε) between the VO₂ phase-change states. This coating utilizes a novel hybrid material architecture that combines VO₂ with the mid- and long-wave infrared transparent chalcogenide, zinc sulfide (ZnS) as a cavity spacer layer. We simulated the design parameter space to obtain a theoretical maximum Δε of 0.63 and grew a prototype device. Using x-ray diffraction, Raman spectroscopy, and Fourier Transform Infrared (FTIR) Spectroscopy, we determined that an intermediate buffer layer of TiO₂ is necessary to execute the polycrystalline growth of VO₂ on ZnS. We optically characterized the pulsed laser deposition grown VO₂ and ZnS using IR-spectroscopic ellipsometry. Through measuring the temperature-dependent FTIR spectroscopy, our prototype sample demonstrated FP-cavity enhanced adaptive thermal emittance.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Raymond Yu, Bo K. Shrewsbury, Claire Wu, Harish Kumarasubramanian, Mythili Surendran, Jayakanth Ravichandran, and Michelle L. Povinelli "Hybrid oxide-chalcogenide thin film cavity for passive thermal adaptive radiation", Proc. SPIE 13015, Photosensitive Materials and their Applications III, 130150I (18 June 2024); https://doi.org/10.1117/12.3022223

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