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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Atom surface trap based on laser-induced quantum adsorption

Anton E. Afanasiev, Павел Николаевич Мелентьев, V. I. Balykin

Published Mar 3, 2008• 0 citations
Publisher

Abstract

A method of the quantum adsorption of atoms on a surface is proposed and experimentally implemented. The loading of atoms into a surface potential well (adsorption) was realized due to the loss of the kinetic energy in the process of the inelastic collision of two laser-excited atoms. This scheme is implemented for Rb atoms adsorbed on the surface of a YAG crystal. The dependence of the quantum adsorption rate on the laser radiation frequency is experimentally investigated. The possibility of producing microstructures of arbitrary shape that consist of atoms localized on the dielectric surface is also demonstrated and the opportunities of creation of nanostructures are discussed.

DOI
10.1117/12.801577

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A method of the quantum adsorption of atoms on a surface is proposed and experimentally implemented. The loading of atoms into a surface potential well (adsorption) was realized due to the loss of the kinetic energy in the process of the inelastic collision of two laser-excited atoms. This scheme is implemented for Rb atoms adsorbed on the surface of a YAG crystal. The dependence of the quantum adsorption rate on the laser radiation frequency is experimentally investigated. The possibility of producing microstructures of arbitrary shape that consist of atoms localized on the dielectric surface is also demonstrated and the opportunities of creation of nanostructures are discussed.
A method of quantum adsorption of atoms on a surface has been proposed and experimentally implemented. Loading of atoms into a surface potential well (adsorption) was realized due to the loss of kinetic energy upon inelastic collision of two laser-excited atoms. This scheme was realized for Rb atoms adsorbed on the surface of a YAG crystal. The dependence of the quantum adsorption rate on the laser frequency has been investigated. A possibility of fabricating microstructures of arbitrary shape from atoms adsorbed on a dielectric surface is demonstrated and possibilities of producing nanostructures is discussed.
A method of the quantum adsorption of atoms on a surface is proposed and experimentally implemented. The loading of atoms into a surface potential well (adsorption) occurs due to the loss of kinetic energy in the process of the inelastic collision of two laser-excited atoms. This scheme is implemented for Rb atoms adsorbed on the surface of a YAG crystal. The possibility of producing microstructures of arbitrary shape that consist of atoms localized on the dielectric surface is also demonstrated.
A new spectroscopic technique for studying adsorption of atoms at a transparent dielectric surface is exploited. A quantitative comparison of the Autler-Townes splitting in measured and calculated, surface temperature-dependent two-photon evanescent wave spectra provides values of the adsorption energy, the preexponential factor for the rate of desorption and the polarizability of alkali atoms, adsorbed on a glass surface. It is speculated that this technique could form the basis for future two-photon control of atoms close to dielectric surfaces.
An optical microtrap is realized on a dielectric surface by crossing a tightly focused laser beam with a horizontal evanescent-wave atom mirror. The nondissipative trap is loaded with $\ensuremath{\sim}{10}^{5}$ cesium atoms through elastic collisions from a cold reservoir provided by a large-volume optical surface trap. With an observed 300-fold local increase of the atomic number density approaching ${10}^{14}{\mathrm{cm}}^{\ensuremath{-}3},$ unprecedented conditions of cold atoms close to a surface are realized.
We discuss our recent experimental demonstrations of three novel atom traps which are all based on the optical dipole force in far-detuned laser light. In the gravito-optical surface trap (GOST), Cs atoms are trapped and cooled by means of an evanescent-wave mirror very closely above a dielectric surface. This trap allows for optical cooling at very high densities and provides good starting conditions for evaporative cooling to quantum degeneracy and the realization of a 2D quantum gas. The conical atom trap (CAT) uses a hollow blue-detuned laser beam in combination with gravity to trap atoms in a dark spatial region. This trap is experimentally simple and provides high loading efficiency, tight confinement, efficient sub-Doppler cooling, and strong suppression of collisional losses. The standing-wave red-detuned (STAR) trap allows one to confine atoms in a shallow optical potential at a very low photon scattering rate, and is thus an interesting tool for studies of the atomic ground-state dynamics in external electro-magnetic fields. We have studied atomic spin polarization in this trap.