Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.26: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Coupling color centers in diamond to fiber based Fabry-Pérot microcavities — •A. Weißl1,2, H. Kaupp1,2, M. Mader1,2, T. Hümmer1,2, C. Deutsch3, H.-C. Chang4, J. Reichel5, H. Fedder6, T. W. Hänsch1,2, and D. Hunger1,21Ludwig-Maximilians-Universität, 80799 München — 2Max-Planck-Institut für Quantenoptik, 85748 Garching — 3Menlo Systems GmbH, 82152 Martinsried — 4Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan — 5Laboratoire Kastler-Brossel, ENS/UPMC-Paris 6/CNRS, F-7005 Paris, France — 6Universität Stuttgart, 70569 Stuttgart

We study nitrogen-vacancy (NV) centers coupled to fiber-based Fabry-Pérot cavities. We apply an optical fiber with machined and coated end facet acting as high reflectivity mirror to build low loss optical resonators with free space access [1]. Analyzing optical spectra, we study the enhancement of the fluorescence of NV centers. We demonstrate the scaling behavior of the Purcell enhancement by varying the mode volume as well as the quality factor over a large range. Even though the life time does not change, ideal Purcell factors of several hundreds were observed [2]. In another approach we want to use a diamond nanocrystal large enough to provide nanoscale field confinement by itself in order to build ultra-small mode volume cavities. Embedding the crystal between a pair of silver layers, a Fabry-Pérot cavity mode can be defined with mode volumes down to 0.1 (λ/n)3 resulting in large Purcell enhancement. [1] D. Hunger, AIP Advances 2, 012119 (2012) [2] H. Kaupp et al., PRA 88, 053812 (2013)

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