Coherent emission of light by thermal sources

By Jean-Jacques Greffet, Rémi Carminati, K. Joulain, J. Mulet, S. Mainguy, Yong Chen. Nature, 2002

1,336 citations recorded by the source corpus.

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 recently 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 effect. The origin of the coherent emission lies in the diffraction of surface-phonon polaritons by the grating.

Subfields: Biomedical Engineering, Civil and Structural Engineering, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/eed2761a8c3d6b7282f86bac72ffe29915a1a49f

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Citations in the corpus

Solution of near-field thermal radiation in one-dimensional layered media using dyadic Green's functions and the scattering matrix method (2009, neutral): “emission [9–12].”
Optical absorbers based on strong interference in ultra‐thin films (2016, background): “Indeed, in the literature, engineering the wavelength- and/or angle-dependence of ε has been achieved using a variety of optical methods including surface texturing with disordered structures [87], gratings [88], photonic crystals [89] [90], optical cavities [91], as well as plasmonic and metamateri”
Narrowband Wavelength Selective Thermal Emitters by Confined Tamm Plasmon Polaritons (2017, background): “Wavelength selective thermal emitters have gathered great attention recently due to the narrow band radiation [1-3].”