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We investigate the temperature dependence of the Casimir-Polder interactionin the electrostatic limit. This unusual phenomenon relies on the couplingbetween a virtual atomic transition and a thermal excitation of surfacepolariton modes. We first focus on the scenario where a Cs(8P3/2) atom is nextto a CaF2 or a BaF2 surface. Our theoretical predictions show a strongtemperature dependence of the van der Waals coefficient at experimentallyaccessible conditions. A series of spectroscopic measurements performed in aspecially designed Cs vapour cell containing a CaF2 tube is presented. Ourresults illustrate the sensitivity of atom surface-interaction experiments tothe quality and chemical stability of the surface material and emphasize theneed of using more durable materials, such as sapphire. We finally discussselective reflection experiments on Cs(7D3/2) in an all-sapphire cell thatclearly demonstrate a temperature dependent van der Waals coefficient.

Experimental observations of temperature effects in the near-field regime of the Casimir-Polder interaction