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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.7: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Design and optimization of a confocal microscopy setup for the investigation of nitrogen-vacancy centres in diamond — •Lukas Götz, Tingpeng Luo, Felix Hahl, and Jan Jeske — Fraunhofer IAF, Freiburg, Germany

Nitrogen vacancy centres in diamond are a promising and widely employed system in a variety of applications as a highly sensitive or nanoscale magnetic field sensor. Diamond as a carrier material as well as the NV centre have to be characterized with high precision. In our work, we focus on crucial points and improvements in the design of a custom-built confocal microscope for this purpose.

We present a combined confocal setup for fluorescence maps, identification of single NVs, optical spectra, optically detected magnetic resonance (ODMR), and pulsed coherence time measurements of the NV centre. Our setup aims to combine flexibility with rigorous stability and fast measurements (collection efficiency and control). The setup presented here relies largely on fibres. In particular, the coupling into a fibre substitutes the confocal pinhole, and a fibre beam splitter allows for the Hanbury-Brown-Twiss (HBT) experiment. The stability and advantages of the fibre solution will be discussed.