Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.67: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Reflection spectroscopy on laser-cooled atoms trapped around an optical nanofiber — •Bernhard Albrecht, Igor Mazets, Rudolf Mitsch, Daniel Reitz, Clément Sayrin, Philipp Schneeweiss, and Arno Rauschenbeutel — Vienna Center for Quantum Science and Technology, TU Wien, Atominstitut, Stadionallee 2, A-1020 Wien, Austria

Tapered optical fibers with a waist diameter smaller than the optical wavelength have recently been used to trap and optically interface laser-cooled cesium atoms [1,2]. In addition to their potential as a building block in a quantum network, nanofiber-trapped atoms are a promising model system for fundamental investigations on light-matter interaction. Here, we report on our latest experimental results on reflection spectroscopy of cesium atoms trapped in a one-dimensional optical lattice about 200 nm above the nanofiber surface. The atoms are randomly loaded into this lattice while the collisional blockade effect limits the number of atoms per trapping site to one at most. Reflection spectra are taken in regimes dominated by coherent and by incoherent scattering. The data is well described by a model that considers radiation transfer in a non-linear inhomogeneous medium. Our results contribute to the deeper understanding of light propagation through complex atomic media and are an important step towards cavity QED with atomic mirrors [3].

[1] E. Vetsch et al., Phys. Rev. Lett 104, 203603 (2010).

[2] E. Vetsch et al., IEEE J. Quantum Electron 18, 1763 (2012).

[3] D. E. Chang et al., New J. Phys. 14, 063003 (2012).