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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Thermally tunable optical constants of vanadium dioxide thin films measured by spectroscopic ellipsometry
Optics Communications, Volume 284, No. 3, Year 2011
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Description
Smart materials with reversible tunable optical constants from visible to near-infrared wavelengths could enable excellent control over the resonant response in metamaterials, tunable plasmonic nanostructures, optical memory based on phase transition and thermally tunable optical devices. Vanadium dioxide (VO2) is a promising candidate that exhibits a dramatic change in its complex refraction index or complex dielectric function arising from a structural phase transition from semiconductor to metal at a critical temperature of 70 °C. We demonstrated the thermal controllable reversible tunability of optical constants of VO2 thin films. The optical/dielectric constants showed an abrupt thermal hysteresis which confirms clearly the electronic structural changes. Temperature dependence of dielectric constants as well as optical conductivity of sputtered VO2 thin films was also reported and compared to previous theoretical and experimental reports. © 2010 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Kana-Kana, Jean Bosco
South Africa, Somerset West
Ithemba Laboratory for Accelerator-based Sciences
Cameroon, Yaounde
Université de Yaoundé I
Ndjaka, Jean Marie Bienvenu
Cameroon, Yaounde
Université de Yaoundé I
Vignaud, Guillaume
France, Lorient
Université de Bretagne-sud
Gibaud, Alain
France, Le Mans
Le Mans Université
Mǎaza, Maalik M.
South Africa, Somerset West
Ithemba Laboratory for Accelerator-based Sciences
Statistics
Citations: 166
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1016/j.optcom.2010.10.009
ISSN:
00304018