title: Near-field heat transfer in a scanning thermal microscope.
abstract: We present measurements of the near-field heat transfer between the tip of a thermal profiler and planar material surfaces under ultrahigh vacuum conditions. For tip-sample distances below 10(-8) m, our results differ markedly from the prediction of fluctuating electrodynamics. We argue that these differences are due to the existence of a material-dependent small length scale below which the macroscopic description of the dielectric properties fails, and discuss a heuristic model which yields fair agreement with the available data. These results are of importance for the quantitative interpretation of signals obtained by scanning thermal microscopes capable of detecting local temperature variations on surfaces.
authors.affiliation: Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany.
authors.forename: Achim
authors.initials: A
authors.lastname: Kittel
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Müller-Hirsch
authors.forename: Jürgen
authors.initials: J
authors.lastname: Parisi
authors.forename: Svend-Age
authors.initials: SA
authors.lastname: Biehs
authors.forename: Daniel
authors.initials: D
authors.lastname: Reddig
authors.forename: Martin
authors.initials: M
authors.lastname: Holthaus