Electric field-assisted metal insulator transition in vanadium dioxide (VO2) thin films: optical switching behavior and anomalous far-infrared emissivity variation

Aurelian Crunteanu; Marc Fabert; Julie Cornette; Maggy Colas; Jean-Christophe Orlianges; Annie Bessaudou; Françoise Cosset

doi:10.1117/12.2076260

13 March 2015 Electric field-assisted metal insulator transition in vanadium dioxide (VO₂) thin films: optical switching behavior and anomalous far-infrared emissivity variation

Aurelian Crunteanu, Marc Fabert, Julie Cornette, Maggy Colas, Jean-Christophe Orlianges, Annie Bessaudou, Françoise Cosset

Author Affiliations +

Proceedings Volume 9364, Oxide-based Materials and Devices VI; 93640J (2015) https://doi.org/10.1117/12.2076260
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

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Aurelian Crunteanu, Marc Fabert, Julie Cornette, Maggy Colas, Jean-Christophe Orlianges, Annie Bessaudou, and Françoise Cosset "Electric field-assisted metal insulator transition in vanadium dioxide (VO₂) thin films: optical switching behavior and anomalous far-infrared emissivity variation", Proc. SPIE 9364, Oxide-based Materials and Devices VI, 93640J (13 March 2015); https://doi.org/10.1117/12.2076260

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