Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.6: Poster
Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer
Temperature dependence of charge conversion during NV-center relaxometry — •Isabel Cardoso Barbosa, Jonas Gutsche, Stefan Dix, Dennis Lönard, and Artur Widera — Physics Department and State Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
Temperature-dependent nitrogen-vacancy (NV)-center relaxometry is an established tool to characterize paramagnetic molecules near a sensing diamond. However, charge conversion between the negatively charged NV− and the neutrally charged NV0 impedes these pulsed-laser measurements and influences the results for the T1 time. While the temperature dependence of the NV centers’ T1 time is well-studied, contributions from temperature-dependent charge conversion during the dark time τ may further affect the measurement results. We combine temperature-dependent relaxometry and fluorescence spectroscopy to unravel the temperature dependence of charge conversion in nanodiamond for biologically relevant temperatures. While we observe a decrease of the T1 time with increasing temperature, charge conversion remains unaffected by the temperature change. These results allow the temperature-dependent performance of T1 relaxometry without further consideration of temperature dependence of charge conversion.
Keywords: nitrogen-vacancy center; charge conversion; relaxometry; temperature dependence