Konstanz 1998 – wissenschaftliches Programm
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Q: Quantenoptik
Q 48: Atomoptik III
Q 48.6: Vortrag
Donnerstag, 19. März 1998, 15:30–15:45, P 603
Recoil and momentum diffusion of an atom close to a vacuum–dielectric interface — •C. Henkel1 and J.-Y. Courtois2 — 1Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam — 2Laboratoire Kastler–Brossel, Ecole Normale Supérieure et Université Pierre et Marie Curie, 24 rue Lhomond, F–75231 Paris CEDEX 05
We derive the quantum-mechanical master equation (generalized optical Bloch equation) for an atom in the vicinity of a flat dielectric surface. This equation gives access to the semiclassical radiation pressure force and the atomic momentum diffusion tensor, which are expressed in terms of the vacuum field correlation function (electromagnetic field susceptibility). We show in particular that in a circularly polarized evanescent wave, the radiation pressure force experienced by the atoms is not colinear with the evanescent’s wave propagation vector, and that due to the atomic recoil, even a linearly polarized evanescent wave leads to a net optical pumping effect for a J=1/2 ground state.