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Coherent emission of light by thermal sources

Author

Listed:
  • Jean-Jacques Greffet

    (Laboratoire EM2C, CNRS
    The Institute of Optics, University of Rochester)

  • Rémi Carminati

    (Laboratoire EM2C, CNRS)

  • Karl Joulain

    (Laboratoire EM2C, CNRS)

  • Jean-Philippe Mulet

    (Laboratoire EM2C, CNRS)

  • Stéphane Mainguy

    (CEA CESTA)

  • Yong Chen

    (Laboratoire de Microstructures et de Microélectronique, CNRS)

Abstract

A thermal light-emitting source, such as a black body or the incandescent filament of a light bulb, is often presented as a typical example of an incoherent source and is in marked contrast to a laser. Whereas a laser is highly monochromatic and very directional, a thermal source has a broad spectrum and is usually quasi-isotropic. However, as is the case with many systems, different behaviour can be expected on a microscopic scale. It has been shown recently1,2 that the field emitted by a thermal source made of a polar material is enhanced by more than four orders of magnitude and is partially coherent at a distance of the order of 10 to 100 nm. Here we demonstrate that by introducing a periodic microstructure into such a polar material (SiC) a thermal infrared source can be fabricated that is coherent over large distances (many wavelengths) and radiates in well defined directions. Narrow angular emission lobes similar to antenna lobes are observed and the emission spectra of the source depends on the observation angle—the so-called Wolf effect3,4. The origin of the coherent emission lies in the diffraction of surface-phonon polaritons by the grating.

Suggested Citation

  • Jean-Jacques Greffet & Rémi Carminati & Karl Joulain & Jean-Philippe Mulet & Stéphane Mainguy & Yong Chen, 2002. "Coherent emission of light by thermal sources," Nature, Nature, vol. 416(6876), pages 61-64, March.
    • Handle: RePEc:nat:nature:v:416:y:2002:i:6876:d:10.1038_416061a
    DOI: 10.1038/416061a
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    Cited by:

    1. Wijewardane, S. & Goswami, Yogi, 2012. "Exergy of partially coherent thermal radiation," Energy, Elsevier, vol. 42(1), pages 497-502.
    2. Wijewardane, S. & Goswami, Yogi, 2014. "Extended exergy concept to facilitate designing and optimization of frequency-dependent direct energy conversion systems," Applied Energy, Elsevier, vol. 134(C), pages 204-214.
    3. J. Enrique Vázquez-Lozano & Iñigo Liberal, 2023. "Incandescent temporal metamaterials," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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