Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-24
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3 figures
Scientific paper
The control of heat flow is a formidable challenge due to lack of good thermal insulators. However as a result of progress made for radiative heat transfer in near field it was recently theoretically predicted that, by tuning electronic excitations on surfaces, large radiative heat flow contrasts, and thus better control of heat flow, may be achieved. Here we show experimentally that the phase transition of VO2 entails a change of surface polariton states that significantly affects radiative heat transfer in near field. In addition we observed a strong dependence of the farfield limit on the VO2 layer thickness. We found that in all cases the Derjaguin approximation correctly predicted radiative heat transfer in near field, but it underestimated the farfield limit. Our results indicate that a large contrast in heat flow can be realized in near field that is otherwise not attainable inside bulk material or in farfield.
Chevrier Joel
Ranno Laurent
van Zwol Pieter Jan
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