Blue-detuned optical ring trap for Bose-Einstein condensates based on conical refraction
Turpin Avilés, Alejandro (Universitat Autònoma de Barcelona. Departament de Física)
Polo Gomez, Juan (Universitat Autònoma de Barcelona. Departament de Física)
Loiko, Yu V. (Aston Institute of Photonic Technologies)
Küber, Johannes (Technische Universität Darmstadt. Institut für Angewandte Physik)
Schmaltz, F. (Technische Universität Darmstadt. Institut für Angewandte Physik)
Kalkandjiev, Todor Kirilov (Universitat Autònoma de Barcelona. Departament de Física)
Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física)
Birkl, Gerhard (Technische Universität Darmstadt. Institut für Angewandte Physik)
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2015
Resum:	We present a novel approach for the optical manipulation of neutral atoms in annular light structures produced by the phenomenon of conical refraction occurring in biaxial optical crystals. For a beam focused to a plane behind the crystal, the focal plane exhibits two concentric bright rings enclosing a ring of null intensity called the Poggendorff ring. We demonstrate both theoretically and experimentally that the Poggendorff dark ring of conical refraction is confined in three dimensions by regions of higher intensity. We derive the positions of the confining intensity maxima and minima and discuss the application of the Poggendorff ring for trapping ultra-cold atoms using the repulsive dipole force of blue-detuned light. We give analytical expressions for the trapping frequencies and potential depths along both the radial and the axial directions. Finally, we present realistic numerical simulations of the dynamics of a ⁸⁷Rb Bose-Einstein condensate trapped inside the Poggendorff ring which are in good agreement with corresponding experimental results.
Ajuts:	Ministerio de Economía y Competitividad FPI/BES-2012-053447 Ministerio de Ciencia e Innovación FIS2011-23719 Ministerio de Ciencia e Innovación AP2010-2310 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-00347
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Analytical expressions ; Bose-Einstein condensates ; Conical refraction ; Light structures ; Optical crystals ; Optical manipulation ; Three dimensions ; Trapping frequency
Publicat a:	Optics express, Vol. 23, issue 2 (Jan. 2015) , p. 1638-1650, ISSN 1094-4087

DOI: 10.1364/OE.23.001638

13 p, 1.7 MB

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