Strong Near-Field Enhancement of Radiative Heat Transfer between Metallic Surfaces

NadpisStrong Near-Field Enhancement of Radiative Heat Transfer between Metallic Surfaces
Publication TypeJournal Article
Year of Publication2012
AuthorsKrálík, T. - Hanzelka, P. - Zobač, M. - Musilová, V. - Fořt, T. - Horák, M.
JournalPHYSICAL REVIEW LETTERS
Volume109
Date Published11/2012
Type of ArticleArticle
ISSN0031-9007
Abstract

Near-field heat transfer across a gap between plane-parallel tungsten layers in vacuo was studied experimentally with the temperature of the cold sample near 5 K and the temperature of the hot sample in the range 10–40 K as a function of the gap size d. At gaps smaller than one-third of the peak wavelength lambda(m) given by Wien's displacement law, the near-field effect was observed. In comparison with blackbody radiation, hundred times higher values of heat flux were achieved at d approximate to 1 mu m. Heat flux normalized to the radiative power transferred between black surfaces showed scaling (lambda(m)/d)(n), where n approximate to 2.6. This Letter describes the results of experiment and a comparison with present theory over 4 orders of magnitude of heat flux.

DOI10.1103/PhysRevLett.109.224302