Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.103: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

High Sensitivity Magnetic Sensing by Ensemble Measurements on Densely Packed Defect Centers in Bulk Diamond — •Thomas Wolf, Merle Becker, Gopalakrishnan Balasubramanian, Fedor Jelezko, and Jörg Wrachtrup — 3rd Physics Institute and Research Center SCOPE, University of Stuttgart

Single, fluorescent defect centers in diamond namely the NV-center have led to numerous scientific contributions in the past in apparently very different areas of application, e.g. quantum computing and spintronics^[1], fluorescence and high resolution optical microscopy^[2] and magnetometry.

In this work approaches towards high sensitivity magnetometry are presented using ensemble measurements on densely packed NV-centers in bulk diamond at room temperature. Using EPR and optical techniques, the spin states of the NV-centers can be changed and read out. The sensitivity towards external magnetic fields of these measurements (for a single NV-center 3nT/Hz^1/2 has been shown) scales with the square root of the number of NV-centers probed^[3]. Ensemble measurements give the opportunity for high sensitivity magnetic sensing with a projected sensitivity in the range of fT/Hz^1/2 while keeping the dimensions of the sensor small.

[1] P. Neumann et al., Science 320, 5881, 1326-1329 (2008)

[2] G. Balasubramanian et al., Nature 455, 648-651 (2008)

[3] J. Taylor et al., Nature Physics, 4, 810-816 (2008)