Abstract

This contribution reports, for what we believe is the first time, on ${{\rm{VO}}_2}$-based thin-film coatings on flexible Al substrates exhibiting a tunable positive emittance-switching $\Delta \varepsilon = (\varepsilon_{\rm H} {\text -} \varepsilon_{\rm L}) \gt {{0}}$. More precisely, a layered stack of a-${\rm{Si}}\!:\!{\rm{H}}/ {\rm{Si}}{{\rm{O}}_2}/{{\rm{VO}}_2}$ on flexible Al sheets presents minimum and maximum values of emissivity of about 0.18 and 0.57 at 40ºC and 83ºC, respectively, and hence allows an emittance-switching $\Delta \varepsilon$ of 0.39 and a relative variation $\Delta \varepsilon /\varepsilon_\Lambda$ of $\,{\sim}{{217}}\%$. Such variations fit with the potential applications of such coatings as smart radiation devices in small satellites and spacecraft.

© 2020 Optical Society of America

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