Coherent thermal radiation
Coherent thermal radiation
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相干热辐射
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
C. Henkel
中科院分区：
文献类型：
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作者：
J. Greffet;C. Henkel
与激光辐射不同，受热体发出的辐射通常被认为是非相干辐射的典型例子。一种几乎是各向同性的，另一种是高度方向性的；一种是宽光谱的，另一种是准单色的。令人惊讶的是，当在距离物体比波长短的距离处观察时，大量物质的热辐射在空间和时间上都是相干的。这种行为可以通过热发射的电磁方法来理解。最近的一些实验证实了这些意想不到的特性。
The radiation emitted by a heated body is generally quoted as a typical example of incoherent radiation, in distinction to laser radiation. One is nearly isotropic, the other highly directional; one is spectrally broad, the other quasi-monochromatic. It may come as a surprise that the thermal radiation of a large number of substances is coherent, both in space and time, when it is observed at a distance from the body that is shorter than the wavelength. This behaviour can be understood within an electromagnetic approach to thermal emission. Several recent experiments have confirmed these unexpected properties.