Spatial coherence of the thermal electromagnetic field in the vicinity of a dielectric slab (Proceedings Paper)

We analyze the spatial coherence of thermal field emitted from a lossy dielectric slab using fluctuation-dissipation theorem.¹ For a given wavelength λ, the coherence property varies drastically with the distance from the slab surface. The coherence length is roughly λ / 2 in the far-field zone, but in the extreme near-field zone, it is many orders of magnitude smaller than λ, due to spatially fluctuating surface charges at the air-dielectric interfac

DOI: 10.1117/12.761909
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