Cold atoms in videotape micro-traps

Sinclair, C.D.J.; Retter, Jocelyn A.; Curtis, E. A.; Hall, Budd L.; Llorente-Garcia, Isabel; Eriksson, S.; Sauer, B. E.; Hinds, E. A.

doi:10.1140/epjd/e2005-00088-6

Cited by 36 publications

(49 citation statements)

References 27 publications

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“…This introduces a spatially varying magnetic field component parallel to the wire which corrugates the bottom of the trap potential. While more advanced microfabrication techniques have been used to produce wires with extremely straight edges, thereby minimizing fragmentation [18,19], the first experiments with permanent magnet atom chips have now also indicated the presence of significant fragmentation [12,20,21]. This has motivated further work towards understanding the mechanisms that cause fragmentation near magnetic materials.…”

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Effect of magnetization inhomogeneity on magnetic microtraps for atoms

et al. 2007

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We report on the origin of fragmentation of ultracold atoms observed on a magnetic film atom chip. Radio frequency spectroscopy and optical imaging of the trapped atoms is used to characterize small spatial variations of the magnetic field near the film surface. Direct observations indicate the fragmentation is due to a corrugation of the magnetic potential caused by long range inhomogeneity in the film magnetization. A model which takes into account two-dimensional variations of the film magnetization is consistent with the observations. PACS numbers: 03.75. Be, 07.55.Ge, 34.50.Dy, 39.25.+k An atom chip is designed to manipulate magnetically trapped ultracold atoms near a surface using an arrangement of microfabricated wires or patterned magnetic materials [1]. Since the realization of Bose-Einstein condensates (BECs) on atom chips [2,3], pioneering experiments have studied single-mode propagation along waveguides [4], transport and adiabatic splitting of a BEC [5] and recently on-chip atom interferometry [6,7]. Permanent magnets are particularly attractive for atom chips as they can provide complex magnetic potentials [8] while suppressing current noise that causes heating and limits the lifetime of trapped atoms near a surface [9]. To date, permanent magnet atom chips have been developed with a view to study one-dimensional quantum gases [10,11,12], decoherence of BEC near surfaces [9,13], hybrid magnetic and optical trapping configurations [14], and self biased fully permanent magnetic potentials [15]. It has been found, however, that in addition to current noise, atom chips have other limitations, as undesired spatial magnetic field variations associated with the current-carrying wires or magnetic materials act to fragment the trapped atoms.In previous work, fragmentation of atoms trapped near current-carrying wires was traced to roughness of the wire edges that causes tiny current deviations [16,17]. This introduces a spatially varying magnetic field component parallel to the wire which corrugates the bottom of the trap potential. While more advanced microfabrication techniques have been used to produce wires with extremely straight edges, thereby minimizing fragmentation [18,19], the first experiments with permanent magnet atom chips have now also indicated the presence of significant fragmentation [12,20,21]. This has motivated further work towards understanding the mechanisms that cause fragmentation near magnetic materials.In this paper we report on the origin of fragmentation near the surface of a permanent magnetic film atom chip. To characterize the magnetic field near the film surface * Electronic address: brhall@swin.edu.au we have developed a technique which combines precision radio frequency (rf) spectroscopy of trapped atoms with high spatial resolution optical imaging. This allows sensitive and intrinsically calibrated measurements of the magnetic field landscape to be made over a large area. We find the fragmentation originates from long range inhomogeneity in the film magnetization and ha...

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Effect of magnetization inhomogeneity on magnetic microtraps for atoms

et al. 2007

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“…It has been shown that Bose-Einstein condensation can be achieved on atom chips, both with current-carrying wire traps 15 and with permanent magnet traps. 16 Consequently it may be possible to create an array of condensates loaded from these MOTs. Alternatively, if there is just one atom per site, the array would have possible applications in quantum information processing.…”

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Pyramidal micromirrors for microsystems and atom chips

Trupke

Ramírez-Martínez

Curtis

et al. 2006

Applied Physics Letters

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Concave pyramids are created in the ͑100͒ surface of a silicon wafer by anisotropic etching in potassium hydroxide. High quality micromirrors are then formed by sputtering gold onto the smooth silicon ͑111͒ faces of the pyramids. These mirrors show great promise as high quality optical devices suitable for integration into micro-optoelectromechanical systems and atom chips. We have shown that structures of this shape can be used to laser-cool and hold atoms in a magneto-optical trap.

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“…17,18 If a FG film is designed to have large coercivity and high saturation magnetization, magneticdomain patterns recorded on the film can be used as miniature optically transparent permanent magnets, e.g., in the manipulation of magnetic colloidal particles [19][20][21] and trapping of dilute gaseous samples of laser-cooled atoms. [22][23][24] In the past few years, research attention has also been paid to ultrafast magnetization phenomena in FG materials. By employing a FG film that has in-plane magnetization and essentially no domain activity, all-optical modulation of the direction of magnetization on the femtosecond time scale has been demonstrated.…”

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All-optical reversible switching of local magnetization

Shevchenko¹,

Korppi²,

Lindfors³

et al. 2007

Applied Physics Letters

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Articles you may be interested inPolycrystalline magnetic garnet films comprising weakly coupled crystallites for piezoelectrically-driven magnetooptic spatial light modulators J. Appl. Phys. 111, 07A519 (2012) The authors demonstrate all-optical reversible switching of the magnetization direction in a uniformly magnetized ferrite-garnet film. The magnetization is switched by locally heating the film with a pulsed laser beam. The direction to which the magnetization flips is controlled by two parameters, the beam diameter and the pulse energy, and not by the direction of the external magnetic field. In the experiments, neither the magnitude nor the direction of the external magnetic field is changed. The results of this work illustrate the richness of optical methods to locally control the properties of magnetic materials and suggest all-optical device applications.

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Cold atoms in videotape micro-traps

Cited by 36 publications

References 27 publications

Effect of magnetization inhomogeneity on magnetic microtraps for atoms

Effect of magnetization inhomogeneity on magnetic microtraps for atoms

Pyramidal micromirrors for microsystems and atom chips

All-optical reversible switching of local magnetization

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