Microscopic calculation of noise current operators for electromagnetic field quantization in absorbing material systems

We present a microscopic quantization scheme for the electromagnetic field in dispersive and lossy dielectrics of arbitrary geometry. This method also describes anisotropic media and media driven by light field via a spatiall y nonlocal permittivity. The method removes the need for complicated diagon alization of material, reservoir and field variables and allows us to inclu de the effect of all the material excitations. Dissipation inside the mediu m is described by considering the coupling of the polarization quanta of th e system with the reservoir oscillators in the usual Langevin approach.