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Hot alkali metal vapors enclosed in sub-micron spectroscopic cells provide anideal system for fundamental studies of the atom-wall and atom-lightinteractions at nanoscale. Here, we propose a novel approach for calculatingthe eigenmodes of a thin-vapor-layer beyond the limitations of the first-orderperturbation theory in optical density for the case of quenching of atomicpolarization upon collisions of atoms with dielectric walls. We show thathigher-order optical density corrections lead to a remarkable density-dependentblue shift and deformation of the spectral line shapes of reflection,transmission, and absorption. We also demonstrate that the eigenmodes of thethin-vapor-layer can be calculated independently of the choice of opticalboundary conditions. This greatly extends the applicability of the constructedtheory for the development of miniature atomic sensors.

physical review. a/physical review, a

Rigorous theory of thin-vapor-layer linear optical properties: The case  of quenching of atomic polarization upon collisions of atoms with dielectric  walls