Near-field effects in spatial coherence of thermal sources

被引:294
作者
Carminati, R [1 ]
Greffet, JJ [1 ]
机构
[1] Ecole Cent Paris, Lab Energet Mol & Macroscopie Combust, CNRS, F-92295 Chatenay Malabry, France
关键词
D O I
10.1103/PhysRevLett.82.1660
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present an exact calculation of the cross-spectral density tensor of the near held thermally emitted into free space by an opaque planar surface. The approach, based on fluctuational electrodynamics and the fluctuation-dissipation theorem, yields novel near-held correlation properties. We show that the spatial coherence length of the field close to the surface at a given wavelength lambda may be much smaller than the well-known lambda/2 of blackbody radiation. We also show that a long-range correlation may exist, when resonant surface waves, such as surface-plasmon or surface-phonon polaritons, are excited. These results should have important consequences in the study of coherence in thermal emission and in the modeling of nanometer scale radiative transfer.
引用
收藏
页码:1660 / 1663
页数:4
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