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Published November 1, 2017 | Published
Journal Article Open

Dipole force free optical control and cooling of nanofiber trapped atoms

Abstract

The evanescent field surrounding nanoscale optical waveguides offers an efficient interface between light and mesoscopic ensembles of neutral atoms. However, the thermal motion of trapped atoms, combined with the strong radial gradients of the guided light, leads to a time-modulated coupling between atoms and the light mode, thus giving rise to additional noise and motional dephasing of collective states. Here, we present a dipole force free scheme for coupling of the radial motional states, utilizing the strong intensity gradient of the guided mode and demonstrate all-optical coupling of the cesium hyperfine ground states and motional sideband transitions. We utilize this to prolong the trap lifetime of an atomic ensemble by Raman sideband cooling of the radial motion which, to the best of our knowledge, has not been demonstrated in nano-optical structures previously. This Letter points towards full and independent control of internal and external atomic degrees of freedom using guided light modes only.

Additional Information

© 2017 Optical Society of America. Received 11 August 2017; revised 16 September 2017; accepted 18 September 2017; posted 19 September 2017 (Doc. ID 304575); published 18 October 2017. Funding: H2020 European Research Council (ERC) (ERC-2011-ADG 20110209). The authors would like to thank S. Markussen for help with data acquisition.

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August 19, 2023
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