A path integral formalism is used to describe the propagation of photons through a transparent medium. It is shown that the reduced phase velocity of light can be understood quantitatively by taking into account the contribution of all the possible classical paths the photon could have taken in order to reach a detector. These paths include all the multiple scattering processes by the atoms in the medium.
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Papers| December 01 1997
Why is the propagation velocity of a photon in a transparent medium reduced?
Bart G. de Grooth; Why is the propagation velocity of a photon in a transparent medium reduced?. Am. J. Phys. 1 December 1997; 65 (12): 1156–1164. https://doi.org/10.1119/1.18754
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