Dr. Manuel Donaire Profile

Dr. Manuel Donaire

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Proceedings Article | 26 July 2011 Paper

Electromagnetic vacuum of random media

M. Donaire

Proceedings Volume 8001, 80011U (2011) https://doi.org/10.1117/12.892127

KEYWORDS: Polarizability, Dielectrics, Chemical species, Dielectric polarization, Electromagnetism, Scattering, Radio propagation, Stochastic processes, Free space, Wave propagation

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We apply the diagrammatic formalism developed in Ref.1 to the study of several phenomena related to the electromagnetic vacuum of molecular dielectrics. Our approach is based on the linear response theory in the dipole approximation and exploits the fluctuation-dissipation theorem. The fundamental object which derives from it is an analytical formula for the polarization propagator in terms of the electrical susceptibility and the single-particle polarizability. That formula is used to compute the spectrum of dipole emission and the total vacuum energy density. In the former, we can distinguish the coherent emission from the total radiative emission. Regarding the latter, we show that the Lamb energy is only a part of it. As a further application, our formalism is applied to calculate, approximately, the optical response of nematic liquid crystals.

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