Highly coherent thermal emission obtained by plasmonic bandgap structures
2008; American Institute of Physics; Volume: 92; Issue: 8 Linguagem: Inglês
10.1063/1.2883948
ISSN1520-8842
AutoresGabriel Biener, Nir Dahan, Avi Niv, Vladimir Kleiner, Erez Hasman,
Tópico(s)Photonic Crystals and Applications
ResumoWe demonstrate an extraordinary quasimonochromatic thermal emission with high spatial coherence length (lc>2400λ) and a quality factor Q=2320 at radiation frequencies that are much smaller than the plasma frequency of metal (ω≪ωp). This emission is achieved by forming a plasmonic bandgap, which is obtained by a periodic structure on a metallic surface. Such a structure modifies the dynamics of the surface wave and results in a van Hove singularity [Van Hove, Phys. Rev. 89, 1189 (1953)] in the spectral density of states while maintaining a large coherence length.
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