TY  - JOUR
A1  - Horsthemke, Ludwig
A1  - Pogorzelski, Jens
A1  - Stiegekötter, Dennis
A1  - Hoffmann, Frederik
A1  - Langguth, Lutz
A1  - Staacke, Robert
A1  - Laube, Christian
A1  - Knolle, Wolfgang
A1  - Gregor, Markus
A1  - Glösekötter, Peter
T1  - Excited-State Lifetime of NV Centers for All-Optical Magnetic Field Sensing
T2  - MDPI Sensors
N2  - We investigate the magnetic field-dependent fluorescence lifetime of microdiamond powder containing a high density of nitrogen-vacancy centers. This constitutes a non-intensity quantity for robust, all-optical magnetic field sensing. We propose a fiber-based setup in which the excitation intensity is modulated in a frequency range up to 100MHz. The change in magnitude and phase of the fluorescence relative to 𝐵=0 is recorded where the phase shows a maximum in magnetic contrast of 5.8∘ at 13MHz. A lock-in amplifier-based setup utilizing the change in phase at this frequency shows a 100 times higher immunity to fluctuations in the optical path compared to the intensity-based approach. A noise floor of 20μT/Hz−−−√ and a shot-noise-limited sensitivity of 0.95μT/Hz−−−√
were determined.
Keywords:
nitrogen-vacancy center; quantum sensor; fluorescence lifetime; all-optical; magnetometr
KW  - Magnetic Field Sensing
Y1  - 2024
UR  - https://www.hb.fh-muenster.de/opus4/frontdoor/index/index/docId/18208
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:836-opus-182083
VL  - 2024
IS  - 24(7)
ER  -