Thickness-modulated temperature dependent optical properties of VO2 thin films
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The optical properties of VO2 have a sharp change during metal–insulator transition, which indicates wide applications in manipulating electromagnetic waves. Here, VO2 thin films with different thicknesses were synthesized by polymer-assisted deposition. The transmittance change trend of the VO2 film with temperature is related with the thickness of the film, which is caused by a dramatic change of complex refractive index during phase transition. However, the transient reflectivity of 150-nm-thick VO2 films presented abnormal change trend with temperature compared with other thinner VO2 films, which may be related with the coexistence of multiphase VO2. The thickness dependent change trend of transmittance and transient reflectivity at specific light may open a new method to fabricate thickness periodic distribution metasurfaces by VO2 film and promote the applications of VO2 film as a metamaterial.
This work is supported by the National Basic Research Program of China (973 Program) under Grant No. 2015CB351905, the National Natural Science Foundation of China (Nos. 51872038 and 11329402) and “111” project (No. B13042).
- 2.S. Liu, T.J. Cui, L. Zhang, Q. Xu, Q. Wang, X. Wan, J.Q. Gu, W.X. Tang, M.Q. Qi, J.G. Han, W.L. Zhang, X.Y. Zhou, Q. Cheng, Adv. Sci. 3, 12 (2016)Google Scholar