Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster II

Q 43.54: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Preparation and spectral characterization of emitter-doped crystals on nanofibers — •David Papencordt, Ariane Stiebeiner, Moritz Numrich, and Arno Rauschenbeutel — VCQ, TU Wien – Atominstitut, Stadionallee 2, 1020 Wien, Austria

Tapered optical fibers with a nanofiber waist have proven to be a highly sensitive tool for surface spectroscopy which exhibits numerous advantages [1,2]. A possible route towards extending the range of applications to the single-molecule level is to deposit dye-doped organic crystals of sub-micron size onto the nanofiber section in order to interface them with the fiber-guided light via the evanescent field surrounding the nanofiber. We present and compare different ways of growing and depositing such crystals. In order to study crystal growth and guest-host interactions in the crystal, we carry out fluorescence and fluorescence excitation spectroscopy. This is achieved by exciting the crystals via the nanofiber while recording the fluorescence light which is coupled back into the fiber-guided mode. Measurements under cryogenic conditions allow us to reduce the homogeneous spectral broadening, a necessary prerequisite for spectrally addressing molecules out of the inhomogeneously broadened ensemble. As a first important step towards single molecule spectroscopy, we observed the statistical fine structure arising from the Poissonian fluctuations of the number of addressed molecules per spectral interval.

[1] F. Warken et al., Opt. Express, 15, 11952 (2007)
A. Stiebeiner et al., Opt. Express, 17, 21704 (2009)