Variation of optical properties of gel-derived VO2 thin films with temperature

Lisong Hou; Song W. Lu; Fuxi Gan

doi:10.1117/12.47194

1 November 1991 Variation of optical properties of gel-derived VO₂ thin films with temperature

Lisong Hou, Song W. Lu, Fuxi Gan

Proceedings Volume 1519, International Conference on Thin Film Physics and Applications; (1991) https://doi.org/10.1117/12.47194
Event: International Conference on Thin Film Physics and Applications, 1991, Shanghai, China

Abstract

VO₂ thin films are prepared on three kinds of substrates by the sol-gel dip-coating method followed by heat treatment under vacuum conditions. The IR and UV-visible spectra of the films are studied during heating and cooling between room temperature and 100 degree(s)C. The experimental results show that the films exhibit thermally-induced reversible phase transition and, as a result, the maximum changes in transmittance and reflectivity are 58% and 25%, respectively, in the case of vacuum heat treatment at 400 degree(s)C and silica glass substrates. The refractive index n decreases and the extinction coefficient k increases when heating these films from room temperature to 100 degree(s)C, and vice versa. The reasons why the optical constants and IR absorption spectra change so remarkably are discussed.

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Lisong Hou, Song W. Lu, and Fuxi Gan "Variation of optical properties of gel-derived VO₂ thin films with temperature", Proc. SPIE 1519, International Conference on Thin Film Physics and Applications, (1 November 1991); https://doi.org/10.1117/12.47194

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