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Near-field thermal radiation between two closely spaced glass plates exceeding Planck's blackbody radiation law

Appl. Phys. Lett. 92, 133106 (2008); doi:10.1063/1.2905286

Published 1 April 2008

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Lu Hu,1 Arvind Narayanaswamy,2 Xiaoyuan Chen,1 and Gang Chen1
1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Columbia University, New York, New York 10027, USA
This work reports experimental studies on radiative heat flux between two parallel glass surfaces. Small polystyrene particles are used as spacers to maintain a micron-sized gap between two optical flats. By carefully choosing the number of particles and performing the measurement in a high-vacuum environment, the experiment is designed to ensure that the radiative heat flux is the dominant mode of heat transfer. The experimental results clearly demonstrate that the radiative heat flux across micron-sized gaps can exceed the far-field upper limit given by Planck's law of blackbody radiation. The measured radiative heat flux shows reasonable agreement with theoretical predictions. ©2008 American Institute of Physics
History: Received 5 February 2008; accepted 14 March 2008; published 1 April 2008
Permalink: http://link.aip.org/link/?APPLAB/92/133106/1
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0003-6951 (print)   1077-3118 (online)
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