SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.20: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

A standalone fiber-bases quantum sensor using ensembles of NV-Centers in diamond — •Benjamin Pohl, Andre Pointner, and Roland Nagy — Chair of Electron Devices, FAU Erlangen-Nuremberg

Though NV-Center magnetometry with diamonds is widely spread in scientific research, it is rarely used in an industrial context. In order to reduce the complexity of the required hardware we fixate the diamond on the tip of a fiber and miniaturize the system so all the required components can be included in a standalone device for magnetic field determination. The measurement is performed with ensembles of NV-Centers used as an optically controlled quantum sensor in a confocal setup. Determination of the magnetic field is achieved through optical detected magnetic resonance (ODMR). In the presence of a local magnetic field, the four orientations of the NV-Centers in the diamond crystal results in up to four different Zeeman splits, which allows the evaluation of the local magnetic field vector. The resulting sensitivity to magnetic fields is strongly dependent on the number of collected signal photons on the detector. Therefore, to increase the sensitivity, the collection efficiency is crucial. Detection of the collected photons is realized by an integrated photodiode and the signal is evaluated by a field programmable gate array (FPGA) which also controls the measurement hardware. Such a standalone device will enable measurements in various environments and provide a system for users without insight to optics or quantum technology, thus greatly extending the possible applications for NV-Centers as quantum sensors.