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Title: Super-Planckian far-zone thermal emission from asymmetric hyperbolic metamaterials

We demonstrate the production of strong directive thermal emissions in the far-field zone of asymmetric hyperbolic metamaterials (AHMs), exceeding that predicted by Planck's limit. Asymmetry is inherent to the uniaxial medium, where the optical axis is tilted with respect to medium interfaces. The use of AHMs is shown to enhance the free-space coupling efficiency of thermally radiated waves, resulting in Super-Planckian far-field thermal emission in certain directions. This effect is impossible in usual hyperbolic materials because emission of high density of states (DOS) photons into vacuum with smaller DOS is preserved by the total internal reflection. Different plasmonic metamaterials are proposed for realizing AHM media; the thermal emission from a AHM, based on a grapheme multilayer structure, is presented, as an example.
Authors:
 [1] ;  [2]
  1. School of Electrical Engineering, Aalto University, P.O. Box 13000, 00076 Aalto (Finland)
  2. Yuri Gagarin State Technical University of Saratov, 77 Politekhnicheskaya, 410054 Saratov (Russian Federation)
Publication Date:
OSTI Identifier:
22350946
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; COUPLING; DENSITY; EFFICIENCY; EMISSION; INTERFACES; LAYERS; MATERIALS; PHOTONS; REFLECTION