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Proceedings Paper

Enhanced coherency of thermal emission by coupled resonant cavities supporting surface waves
Author(s): Nir Dahan; Avi Niv; Gabriel Biener; Yuri Gorodetski; Vladimir Kleiner; Erez Hasman
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Paper Abstract

Surface waves have been shown to play a key role in spontaneous thermal emission in the near-field as well as the coherence and the polarization properties of the nonradiative field. The near-field coherence of the delocalized nonradiative surface waves can be transferred into radiative fields by introducing a shallow grating on the surface. We show that the coherency of the thermal radiation can be enhanced by an order of magnitude compared with the coherency imposed by the delocalized surface waves. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, where each cavity supports localized field that is attributed to coupled surface waves. We realized coupled resonant cavity structure on amorphous SiO2 and crystalline SiC, both support surface phonon-polaritons, to demonstrate extraordinary coherent thermal emission with a high quality factor of 600 and a spatial coherence length of 760λ (8.8mm).

Paper Details

Date Published: 28 January 2008
PDF: 6 pages
Proc. SPIE 6901, Photonic Crystal Materials and Devices VII, 69010A (28 January 2008); doi: 10.1117/12.761205
Show Author Affiliations
Nir Dahan, Technion-Israel Institute of Technology (Israel)
Avi Niv, Technion-Israel Institute of Technology (Israel)
Gabriel Biener, Technion-Israel Institute of Technology (Israel)
Yuri Gorodetski, Technion-Israel Institute of Technology (Israel)
Vladimir Kleiner, Technion-Israel Institute of Technology (Israel)
Erez Hasman, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 6901:
Photonic Crystal Materials and Devices VII
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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