标题： 热近场的空间相干性 显示英文标题

标题： Spatial coherence of thermal near fields

摘要： 我们分析了温度接近界面的半空间发射的电磁场的空间相干性。 渐近分析使能够识别近场区域中交叉谱密度张量的三种不同贡献。 结果表明，根据主要贡献的不同，相干长度可能远大于或远小于波长。 显示英文摘要

摘要： We analyze the spatial coherence of the electromagnetic field emitted by a half-space at temperature T close to the interface. An asymptotic analysis allows to identify three different contributions to the cross-spectral density tensor in the near-field regime. It is shown that the coherence length can be either much larger or much shorter than the wavelength depending on the dominant contribution.