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Optical ferris wheel for ultracold atoms

S. Franke-Arnold·J. Leach·M. J. Padgett·V. E. Lembessis·D. Ellinas·A. J. Wright·J. M. Girkin·P. Ohberg·A. S. Arnold
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Abstract

We propose a versatile optical ring lattice suitable for trapping cold and quantum degenerate atomic samples at discrete angular positions. We demonstrate the realisation of intensity patterns generated from Laguerre-Gauss ($\exp(i \ellθ)$) modes with different $\ell$ indices. The ring lattice can have either intensity maxima or minima, suitable for trapping in red or blue detuned light, and it can be rotated by introducing a frequency shift between the Laguerre Gauss modes. The potential wells can be joined to form a uniform ring trap, making it ideal for studying persistent currents and the Mott insulator transition in a ring geometry.

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S. Franke-Arnold, J. Leach, M. J. Padgett, V. E. Lembessis, D. Ellinas, A. J. Wright, J. M. Girkin, P. Ohberg, A. S. Arnold. 2006-11-15. Optical ferris wheel for ultracold atoms. https://doi.org/10.1364/oe.15.008619

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