Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.73: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II

Optical Studies and Charge State Detection of single Nitrogen-Vacancy Centers in Diamond — •Nabeel Ahmad Aslam1, Gerald Waldherr1, Philipp Neumann1, Fedor Jelezko2, and Jörg Wrachtrup113. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany — 2Institut für Quantenoptik, Universität Ulm, Germany

When Gruber et al. [1] first studied optical and spin properties of single Nitrogen-Vacancy centers (NV) in diamond they hardly imagined that NV centers will be widely applied in nanoscale magnetometry, single photon sources and many more fields in future such as quantum computation. The negatively charged NV center has the properties to fulfill the requirements of each of these fields. But since Waldherr et al. [2] showed that the negatively charged NV center is for 30 % of time in a different charge state, the NV0, further studies were necessary. We have explored the excitation wavelength- and power- dependence of the NV fluorescence emission. Furthermore we were able to measure the ionization rates into the NV0 state (Waldherr et al. [2]) for varying excitation wavelengths. Additionally, a new method is introduced that enables us to detect the charge state. These studies help to understand the photodynamics of the NV center. [1] A. Gruber et al. Scanning confocal optical microscopy and magnetic resonance on single defect centers. Science, 276:2012, 1997. [2] G. Waldherr et al. Dark States of Single Nitrogen-Vacancy Centers in Diamond Unraveled by Single Shot NMR. Physical Review Letters 106(15), 157601 (Apr 2011)

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