Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quanteneffekte (Lichtstreuung II)
Q 59.3: Vortrag
Donnerstag, 22. März 2007, 14:30–14:45, 5E
Towards coupling of two distant emitters — •Robert Lettow1, Stephan Götzinger1, Ville Ahtee2, Erkki Ikonen2, and Vahid Sandoghdar1 — 1Laboratory of Physical Chemistry, ETH Zürich, CH-8093 Zürich — 2Metrology Research Institute, Helsinki University of Technology, Finland
We report on experiments where two organic dye molecules are coupled over a long distance. Although both coherent and incoherent coupling of emitters have been demonstrated in the near field via the dipole-dipole interaction, coupling of two quantum optical systems separated by more than a wavelength remains a challenge due to several experimental difficulties. In the gas phase the detection and excitation efficiencies are very low while in the solid state usually the spectral inhomogeneity, the coupling to phonons and a low absorption cross section pose problems. In our laboratory, we have set up an experiment where single molecules in two different samples are detected simultaneously at liquid helium temperature. By using microscope objectives of high numerical aperture, we achieve very efficient excitation of the molecules and collection of their emitted photons. Furthermore, by applying local electric fields, we tune the Fourier limited zero-phonon lines of the two molecules to make them spectrally indistinguishable. We present the current status of this experiment and discuss future plans.