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By measuring the transmission of near-resonant light through an atomic vaporconfined in a nano-cell we demonstrate a mesoscopic optical response arisingfrom the non-locality induced by the motion of atoms with a phase coherencelength larger than the cell thickness. Whereas conventional dispersion theory-- where the local atomic response is simply convolved by the Maxwell-Boltzmannvelocity distribution -- is unable to reproduce the measured spectra, a modelincluding a non-local, size-dependent susceptibility is found to be inexcellent agreement with the measurements. This result improves ourunderstanding of light-matter interaction in the mesoscopic regime and hasimplications for applications where mesoscopic effects may degrade or enhancethe performance of miniaturized atomic sensors.

Optical transmission of an atomic vapor in the mesoscopic regime