General relation between spatial coherence and absorption

• Main Authors: Tihon, Denis, Withington, Stafford, Bailly, Elise, Vest, Benjamin, Greffet, Jean-Jacques
• Format: Journal Article
• Language: English
• Published: 15-11-2021
• Subjects: Physics - Optics
• DOI: 10.48550/arxiv.2005.05087

Despite the fact that incandescent sources are usually spatially incoherent,
it has been known for some time that a proper design of a thermal source can
modify its spatial coherence. A natural question is whether it is possible to
extend this analysis to electroluminescence and photoluminescence. A
theoretical framework is needed to explore these properties. In this paper, we
extend a general coherence-absorption relation valid at equilibrium to two
non-equilibrium cases: luminescent bodies and anisothermal bodies. We then use
this relation to analyse the differences between the isothermal and
anisothermal cases and to study the near-field emission of an
electroluminescent source.