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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.23: Poster

Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG

Nanoscale Temperature Sensing with Nitrogen-Vacancy Centers in Diamond — •Anja Jovicevic, Wanrong Li, and Oliver Benson — Humboldt-Universität zu Berlin, Germany

Negatively charged nitrogen-vacancy (NV) centers in nanodiamond offer powerful quantum sensing capabilities, particularly for nanoscale thermometry. We exploit the temperature-sensitivity of the ground-state zero-field splitting (ZFS) in NV centers in nanodiamonds: as the diamond lattice expands thermally, the ZFS shifts, and we track the shift using optically detected magnetic resonance (ODMR) under controlled thermal conditions. Excitation is performed with a green laser, while microwave radiation drives the spin transitions; we monitor the resulting fluorescence in the red to near-infrared wavelength regime. We establish a temperature calibration based on the frequency shift of the ODMR resonance. Our measurements for the resonance frequency shift per Kelvin are in agreement with previously reported values of about -77kHz/K. We will introduce gold nanospheres as local heat sources and observe the induced temperature rise in nearby NV centers. This hybrid configuration is intended to form the basis for applications in biological environments: by combining quantum thermometry with localized heating, one could map and control temperature gradients inside living cells with nanometer precision.

Keywords: Quantum sensing; Nitrogen vacancy center; Optically Detected Magnetic Resonance; Nanothermometry