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HL: Fachverband Halbleiterphysik
HL 54: Photonic Crystals: Theory
HL 54.1: Talk
Thursday, March 25, 2010, 14:00–14:15, H13
Thermal emission from finite photonic crystals — •Kurt Busch1, Christian Schuler1, Christian Wolff1, and Marian Florescu2 — 1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Department of Physics, Princeton University, Princeton, NJ 08544, U.S.A.
We present a microscopic theory of thermal emission from truncated photonic crystals
and show that the relevant physical parameters such as the directional spectral
emissivity can be obtained from standard photonic bandstructure computations without
any approximation. This allows us to identify the physical mechanisms how interfaces
modify the potentially super-Planckian radiation flow inside infinite photonic crystals
[1] such that thermal emission from truncated systems remains consistent with the
fundamental limits set by Planck’s law [2]. As an application, we further demonstrate
how a judicious choice of a surface termination facilitates considerable control over
both the spectral and angular thermal emission properties [2,3].
[1] M. Florescu et al., Phys. Rev. B 75, 201101(R) (2007).
[2] C.J. Schuler et al., Appl. Phys. Lett., in press.
[3] C.J. Schuler et al., submitted.