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Comptes Rendus Physique
Volume 18, n° 1
pages 24-30 (janvier 2017)
Doi : 10.1016/j.crhy.2016.11.001
Revisiting thermal radiation in the near field
Le rayonnement thermique revisité en champ proche
 

Fig. 1




Fig. 1 : 

Angular emission pattern of a SiC grating at two different frequencies. It is seen that the emission pattern is similar to the emission pattern of an antenna with narrow lobes. Reproduced from [21].


Fig. 2




Fig. 2 : 

Spectral energy density above a SiC–vacuum interface. a) Normalised spectra of the energy density at three distances. Top: far field, middle: 1 μm, bottom: 10 nm. b) Energy density integrated over all frequencies as a function of the distance to the interface z (logarithmic scale). Reproduced from [28].


Fig. 3




Fig. 3 : 

Radiative heat transfer between two plane surfaces separated by a distance d . a) Heat transfer coefficient as a function of the gap width d . It is seen that the flux varies as 1/d 2 in the small distance regime. Reproduced from [28]. b) Spectrum of the heat transfer coefficient.


Fig. 4




Fig. 4 : 

Origin of the near field enhancement. The flux is proportional to the number of modes. For k <ω /c , the modes are the propagating waves depicted in inset 1. For ω /c <k < /c , the modes correspond to the frustrated total internal reflection as depicted in inset 2. For k > /c , the modes are pure evanescent modes, as depicted in inset 3.

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