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Title: Large penetration depth of near-field heat flux in hyperbolic media

We compare super-Planckian thermal radiation between phonon-polaritonic media and hyperbolic metamaterials. In particular, we determine the penetration depth of thermal photons inside the absorbing medium for three different structures: two semi-infinite phonon-polaritonic media supporting surface modes, two multilayer hyperbolic metamaterials and two nanowire hyperbolic metamaterials. We show that for hyperbolic modes the penetration depth can be orders of magnitude larger than for surface modes suggesting that hyperbolic materials are much more preferable for near-field thermophotovoltaic applications than pure phonon-polaritonic materials.
Authors:
; ;  [1] ; ;  [2]
  1. Institute of Optical and Electronic Materials, Hamburg University of Technology, 21073 Hamburg (Germany)
  2. Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg (Germany)
Publication Date:
OSTI Identifier:
22258620
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; HEAT FLUX; PENETRATION DEPTH; PHONONS; PHOTONS; THERMAL RADIATION