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QI: Fachverband Quanteninformation
QI 37: Poster – Quantum Information Technologies (joint session Q/QI)
QI 37.12: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Phase as the Measurement Quantity in Optically Detected Magnetic Resonance Setups With NV Centers — •Ludwig Horsthemke1, Jonas Homrighausen2, Ann-Sophie Bülter1, Jens Pogorzelski1, Dennis Stiegekötter1, Frederik Hoffmann1, Markus Gregor2, and Peter Glösekötter1 — 1Department of Electrical Engineering and Computer Science, FH Münster — 2Department of Engineering Physics, FH Münster
Measurements of optically detected magnetic resonance (ODMR) with nitrogen-vacancy (NV) centers usually observe the fluorescence intensity while applying a microwave radiation of varying frequency. We propose the phase between the excitation and the fluorescence as an alternative measurement quantity, offering a higher immunity to intensity fluctuations.
The fluorescence decay dynamics of NV centers act as a low pass filter in the frequency domain which changes its frequency response at the application of a resonant MW radiation. Upon intensity modulation of the excitation light at a frequency around 13 MHz we observe a contrast in the phase between excitation and fluorescence. We have previously shown that the phase has a high immunity to intensity fluctuations in all-optical magnetometry setups since we avoid the misinterpretation of changes in fluorescence intensity as changing magnetic fields [1]. In this work, we show the application of the phase measurement in a continuous wave ODMR setup.
[1] Horsthemke, L., et al. Excited-State Lifetime of NV Centers for All-Optical Magnetic Field Sensing. Sensors 24, 2093 (2024).
Keywords: NV Center; ODMR; Phase; Quantum Sensing