Position-dependent photon operators in the quantization of the   electromagnetic field in dielectrics at local thermal equilibrium
  It has very recently been suggested that asymmetric coupling of electromagnetic fields to thermal reservoirs under nonequilibrium conditions can produce unexpected oscillatory behavior in the local photon statistics in layered structures. Better understanding of the predicted phenomena could enable useful applications related to thermometry, noise filtering, and enhancing optical interactions. In this work we briefly review the field quantization and study the local steady state temperature distributions in optical cavities formed of lossless and lossy media to show that also local field temperatures exhibit oscillations that depend on position as well as the photon energy. 
Mikko Partanen, Teppo H\"ayrynen, Jani Oksanen, and Jukka Tulkki
quant-ph