1. Thermal radiative near field transport between vanadium dioxide and silicon oxide across the metal insulator transition.
- Author
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Menges, F., Dittberner, M., Novotny, L., Passarello, D., Parkin, S. S. P., Spieser, M., Riel, H., and Gotsmann, B.
- Subjects
VANADIUM dioxide ,SILICON oxide ,METAL-insulator transitions ,THERMAL conductivity ,TEMPERATURE - Abstract
The thermal radiative near field transport between vanadium dioxide and silicon oxide at submicron distances is expected to exhibit a strong dependence on the state of vanadium dioxide which undergoes a metal-insulator transition near room temperature. We report the measurement of near field thermal transport between a heated silicon oxide micro-sphere and a vanadium dioxide thin film on a titanium oxide (rutile) substrate. The temperatures of the 15 nm vanadium dioxide thin film varied to be below and above the metal-insulator-transition, and the sphere temperatures were varied in a range between 100 and 200 °C. The measurements were performed using a vacuum-based scanning thermal microscope with a cantilevered resistive thermal sensor. We observe a thermal conductivity per unit area between the sphere and the film with a distance dependence following a power law trend and a conductance contrast larger than 2 for the two different phase states of the film. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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