Excited-State Lifetime of NV Centers for All-Optical Magnetic Field Sensing

Author:

Horsthemke Ludwig1ORCID,Pogorzelski Jens1ORCID,Stiegekötter Dennis1ORCID,Hoffmann Frederik1ORCID,Langguth Lutz2,Staacke Robert2ORCID,Laube Christian3ORCID,Knolle Wolfgang3ORCID,Gregor Markus4,Glösekötter Peter1ORCID

Affiliation:

1. Department of Electrical Engineering and Computer Science, FH Münster—University of Applied Sciences, Stegerwaldstr. 39, 48565 Steinfurt, Germany

2. Quantum Technologies GmbH, Alte Messe 6, 04103 Leipzig, Germany

3. Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany

4. Department of Engineering Physics, FH Münster—University of Applied Sciences, Stegerwaldstr. 39, 48565 Steinfurt, Germany

Abstract

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.

Funder

Bundesministerium für Bildung und Forschung

Publisher

MDPI AG

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