Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum information: Photons and nonclassical light I
Q 38.5: Vortrag
Donnerstag, 20. März 2014, 11:30–11:45, UDL HS3038
Narrow-band single photons efficiently filtered by atoms — •Wilhelm Kiefer1, Petr Siyushev1, Robert Löw2, Jörg Wrachtrup1,3, and Ilja Gerhardt1,3 — 13. Physikalisches Institut, Universität Stuttgart — 25. Physikalisches Institut, Universität Stuttgart — 3Max Planck Institute for Solid State Research, Stuttgart
Single organic dye molecules allow for the generation of high flux single photons. Under cryogenic conditions, these can be as narrow-band as a few tens of MHz. It has been shown recently, that the fluorescence spectrum of certain molecules corresponds well to the absorption spectrum of atoms. Therefore, it is possible to join single molecule studies and atomic spectroscopy. One crucial measure is the purity of single photons. Therefore, the generated photons are filtered utilizing an atomic line filter. This so-called Faraday anomalous dispersion optical filter (FADOF) consists of two crossed polarizers, an atomic vapor cell, and a magnetic field. It allows for a few GHz wide band-pass filter, with exceptional high transmission (>95%). We present theoretical calculations to optimize the operating parameters for this filter, which consists of atomic sodium. Based on these calculations, the filter was implemented. The experimental configuration allows for a wide temperature range and a tunable magnetic field up to 0.4T. The theoretical results are confirmed by atomic spectroscopy, using a dye laser. The single photon source, based on single dibenzanthanthrene (DBATT) molecules, allows for an unsurpassed spectral brightness and can be spectrally detuned by the DC-Stark effect. We are able to perform atomic spectroscopy on the filter using a single molecule light source.