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Proceedings Paper

Electric field-assisted metal insulator transition in vanadium dioxide (VO2) thin films: optical switching behavior and anomalous far-infrared emissivity variation
Author(s): Aurelian Crunteanu; Marc Fabert; Julie Cornette; Maggy Colas; Jean-Christophe Orlianges; Annie Bessaudou; Françoise Cosset
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Paper Abstract

We present the vanadium dioxide (VO2) thin films deposition using e-beam evaporation of a vanadium target under oxygen atmosphere on different substrates (sapphire, Si, SiO2/Si…) and we focus on their electrical and optical properties variations as the material undergoes a metal-insulator transition under thermal and electrical stimuli. The phase transition induces extremely abrupt changes in the electronic and optical properties of the material: the electrical resistivity increases up to 5 orders of magnitude while the optical properties (transmission, reflection, refractive index) are drastically modified. We present the integration of these films in simple planar optical devices and we demonstrate electrical-activated optical modulators for visible-infrared signals with high discrimination between the two states. We will highlight a peculiar behavior of the VO2 material in the infrared and far infrared regions (2- 20 μm), namely its anomalous emissivity change under thermal- end electrical activation (negative differential emittance phenomenon) with potential applications in active coatings for thermal regulation, optical limiting or camouflage coatings.

Paper Details

Date Published: 13 March 2015
PDF: 11 pages
Proc. SPIE 9364, Oxide-based Materials and Devices VI, 93640J (13 March 2015); doi: 10.1117/12.2076260
Show Author Affiliations
Aurelian Crunteanu, XLIM Institut de Recherche, CNRS, Univ. de Limoges (France)
Marc Fabert, XLIM Institut de Recherche, CNRS, Univ. de Limoges (France)
Julie Cornette, SPCTS, CNRS, Univ. de Limoges (France)
Maggy Colas, SPCTS, CNRS, Univ. de Limoges (France)
Jean-Christophe Orlianges, SPCTS, CNRS, Univ. de Limoges (France)
Annie Bessaudou, XLIM Institut de Recherche, CNRS, Univ. de Limoges (France)
Françoise Cosset, XLIM Institut de Recherche, CNRS, Univ. de Limoges (France)

Published in SPIE Proceedings Vol. 9364:
Oxide-based Materials and Devices VI
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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