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Papers by T. Taillandier-loize

The European Physical Journal Applied Physics, 2015

In this paper we present numerical and experimental methods aimed at studying the evolution in sp... more In this paper we present numerical and experimental methods aimed at studying the evolution in space and time of a slowed supersonic beam. These generic methods are applicable to a variety of beams and deceleration techniques. The present implemented experimental set up is based upon Zeeman slowing of a metastable atom beam. The detection uses a channel-electron multiplier and a delay-line detector allowing timeof-flight analysis and numerical image reconstruction. In particular a depopulation effect at the centre of the beam is evidenced. In view of quantifying the slowing process, Monte Carlo calculations based on rate-equations are detailed. PACS numbers: 37.10. De (atom cooling methods), 37.10.Vz (Mechanical effects of light on atoms,..), 37.90.+j (Other topics in mechanical control of atoms,…)

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011

Metastable argon atoms Ar*( 3 P 2 ), produced by electron bombardment of a nozzle beam of ground ... more Metastable argon atoms Ar*( 3 P 2 ), produced by electron bombardment of a nozzle beam of ground state Ar atoms, are slowed down from their initial thermal velocity of 560 m/s down to a few tens of m/s, using a standard Zeeman slower. In this decelerator [1], a repulsive force is induced by a counter-propagating σ +polarized laser beam, locked in frequency on the 3 P 2 -3 D 3 closed transition (λ = 811.5 nm) and then detuned by 340 MHz. A special profile of longitudinal magnetic field is adjusted in order to maintain atoms in resonance with light all over the device, by compensating the variable Doppler shift by the convenient Zeeman shift. Low velocities, e.g. 55 m/s, are accessible but due to spontaneous emission randomly distributed recoil momentums enlarge both angular and velocity distributions of the beam [2]. Nevertheless, by placing off axis collimating slits and grating, it is in principle possible to observe transmission and/or diffraction phenomena specific of low velocities.

Physical Review A, 2014

The distance-dependence of the anisotropic atom-wall interaction is studied. The central result i... more The distance-dependence of the anisotropic atom-wall interaction is studied. The central result is the 1/z 6 quadrupolar anisotropy decay in the retarded Casimir-Polder regime. Analysis of the transition region between non-retarded van der Waals regime (in 1/z 3 ) and Casimir-Polder regime shows that the anisotropy cross-over occurs at very short distances from the surface, on the order of 0.03λ, where λ is the atom characteristic wavelength. Possible experimental verifications of this distance dependence are discussed. PACS numbers: 34.35.+a, 03.75.Be, 12.20.Fv The force between neutral polarisable systems is a ubiquitous phenomenon in nature, with many applications in physics, chemistry, biology. . . A paramount example is the long-range interaction potential between neutral microscopic quantum systems, like atomic systems, and a solid surface. For plane surfaces this interaction is usually governed by a power-law attractive potential . For atom-surfaces distances z smaller than the wavelengths of the optical transitions involved in the atomic polarisability, the interaction is of the dipoleinduced dipole type, and governed by the well-known non-retarded van der Waals potential in −C 3 /z 3 , which reflects the correlations of dipole fluctuations [1]. At larger distances, retardation effects get important, and asymptotically lead to a −C 4 /z 4 potential, as demonstrated in the pioneering work of Casimir and Polder [2].

Physical Review A, 2012

A novel technique of atom slowing is proposed. It is based upon the dispersive interaction of ato... more A novel technique of atom slowing is proposed. It is based upon the dispersive interaction of atoms with optical potential pulses generated by a far off-resonance standing wave modulated in time. Each pulse reduces the velocity by a small amount. By repeating the process thousands of times, the velocity can be lowered from several hundreds m/s down to almost zero, over a path as short as 20 cm. In absence of any random recoil process, the initial characteristics of the beam are preserved.

EPL (Europhysics Letters), 2012

van der Waals-Zeeman transitions between magnetic states of metastable rare gas atoms Ar*, Kr* an... more van der Waals-Zeeman transitions between magnetic states of metastable rare gas atoms Ar*, Kr* and Xe* ( 3 P 2 ) induced by a solid surface in the presence of a magnetic field, are investigated theoretically and experimentally. By use of a Zeeman slower, metastable argon atoms with various velocities ranging from 170 to 560 m/s allow us to investigate the small impact-parameter range (3-7 nm) within which these transitions occur, as well as the effect of atom polarisation on the sharing out of the M states.

Advances in OptoElectronics, 2012

The counterpart of meta materials in light optics for non relativistic matter waves governed by t... more The counterpart of meta materials in light optics for non relativistic matter waves governed by the Schrödinger equation, can be found by transiently reversing the group velocity using a so called comoving potential. Possible applications to wave-packet dynamics, atom interferometry and atom deceleration are described.