Berlin 2012 – wissenschaftliches Programm
MA 31.1: Vortrag
Mittwoch, 28. März 2012, 15:00–15:15, BH 243
Fast magnetic imaging using nitrogen-vacancy centers — •Florestan Ziem1, Steffen Steinert1, Andrea Zappe1, Liam Hall2, Lloyd Hollenberg2, Nicolas Götze1, and Jörg Wrachtrup1 — 13rd Physics Institute, University of Stuttgart, 70569 Stuttgart, Germany — 2School of Physics, University of Melbourne, Victoria 3010, Australia
With the aim to image weak electromagnetic signals at high spatial resolution, e.g. signals of a neuron cell, we investigated the potential of an ensemble of negatively charged nitrogen-vacancy centers (NVs) as a sensor. The NV is a color center in diamond consisting of a substitutional nitrogen and an adjacent vacant lattice site. One of the remarkable features of the NV is, that its magnetic spin state can be optically polarized and read out via its fluorescence at ambient conditions. From Zeeman shifts and coherence lifetimes, the presence of static and fluctuating magnetic fields can be deduced. To detect the fluorescence signal, we employ a wide-field approach, where a CCD camera allows us to capture the fluorescence of a 60 µm x 60 µm area of densely implanted NVs within milliseconds. For samples placed on the diamond surface, this setup thus allows for fast, diffraction limited sensing, while being potentially non-invasive. On the other hand, integrating over the full sensor area allows for the detection of low concentrations of magnetic species in homogenous samples. The capabilities of the NV sensor in the spatially resolving and the integrating measurement mode will be evaluated.