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Quantum technologies

Dieter Meschede's research group
Home Group members Eugen Vetsch
Group members
Eugen Vetsch
Last position
in our group:
Former member
Field of research
in our group:
Optical microfibres

Publications(up to 2007)

  • G. Sagué, E. Vetsch, W. Alt, D. Meschede and A. Rauschenbeutel
    Cold-Atom Physics Using Ultrathin Optical Fibers: Light-Induced Dipole Forces and Surface Interactions, Phys. Rev. Lett. 99, 163602 (2007)arXivBibTeXPDF
    The strong evanescent field around ultrathin unclad optical fibers bears a high potential for detecting, trapping, and manipulating cold atoms. Introducing such a fiber into a cold-atom cloud, we investigate the interaction of a small number of cold cesium atoms with the guided fiber mode and with the fiber surface. Using high resolution spectroscopy, we observe and analyze light-induced dipole forces, van der Waals interaction, and a significant enhancement of the spontaneous emission rate of the atoms. The latter can be assigned to the modification of the vacuum modes by the fiber.
  • F. Warken, E. Vetsch, D. Meschede, M. Sokolowski and A. Rauschenbeutel
    Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers, Opt. Express 15, 11952-11958 (2007)arXivBibTeXPDF
    The guided modes of sub-wavelength diameter air-clad optical fibers exhibit a pronounced evanescent field. The absorption of particles on the fiber surface is therefore readily detected via the fiber transmission. We show that the resulting absorption for a given surface coverage can be orders of magnitude higher than for conventional surface spectroscopy. As a demonstration, we present measurements on sub-monolayers of 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) molecules at ambient conditions, revealing the agglomeration dynamics on a second to minutes timescale.
  • E. Vetsch
    Evaneszente-Wellen-Spektroskopie mit ultradünnen optischen Glasfasern, (2005), Diplom thesisBibTeXPDF