Dispersion relations were originally developed by physicists H. Kramers and R. Kronig (Kramers, 1926, p.775 and Kronig, 1926, p. 547). These dispersion relations are a pair of integrals that were developed to relate the real and imaginary parts of a function called the complex index of refraction. This index describes how a material medium affects electromagnetic radiation passing through it, and depends on the frequency of the radiation.
KeywordsImaginary Part Dispersion Relation Integral Representation Real Axis Branch Point
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