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Proceedings Paper

Thermal emission from finite photonic crystals
Author(s): Christian J. Schuler; Christian Wolff; Kurt Busch; Marian Florescu
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Paper Abstract

We present a microscopic theory of thermal emission from truncated photonic crystals and show that spectral emissivity and related quantities can be evaluated via standard bandstructure computations without any approximation. We then analyze the origin of thermal radiation enhancement and suppression inside photonic crystals and demonstrate that the central quantity that determines the thermal radiation characteristics such as intensity and emissive power is the area of the iso-frequency surfaces and not the density of states as is generally assumed. We also identify the physical mechanisms through which interfaces modify the potentially super-Planckian radiation flow inside infinite photonic crystals, such that thermal emission from finite-sized samples is consistent with the fundamental limits set by Planck's law. As an application, we further demonstrate that a judicious choice of a photonic crystal's surface termination facilitates considerable control over both the spectral and angular thermal emission properties. Finally, we outline design principles that allow the maximization of the radiation flux, including effects associated with the isotropy of the effective Brillouin zone, photonic band gap size and flatness of the band structure in the spectral range of interest.

Paper Details

Date Published: 10 September 2010
PDF: 11 pages
Proc. SPIE 7756, Active Photonic Materials III, 77560B (10 September 2010); doi: 10.1117/12.860075
Show Author Affiliations
Christian J. Schuler, Karlsruhe Institute of Technology (Germany)
Christian Wolff, Karlsruhe Institute of Technology (Germany)
Kurt Busch, Karlsruhe Institute of Technology (Germany)
Marian Florescu, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 7756:
Active Photonic Materials III
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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