Mainz 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.22: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

Fiber fluorescence spectra and their impact on NV-based sensors — •Stefan Johansson, Alexander Bukschat, Jonas Gutsche, Dennis Lönard, Alena Erlenbach, and Artur Widera — RPTU University Kaiserslautern-Landau, Physics Department and State Research Center OPTIMAS, Kaiserslautern, Germany

Optical fibers are widely used as light-guiding components in sensing applications, including quantum sensors based on nitrogen-vacancy (NV) centers in diamond. For such miniaturized, fiber-integrated NV magnetometers, background fluorescence generated within the fiber, arising from scattering processes and intrinsic photoactive impurities, can spectrally overlap with the NV centers' fluorescence. This autofluorescence reduces the signal-to-noise ratio and ultimately limits the achievable magnetic-field sensitivity, particularly when the number of active spins is small. We systematically analyze the optical emission spectra of commonly used optical fibers under excitation at wavelengths relevant for NV centers. We investigate the influence of the materials used in the fabrication process and fiber type, and we study how the generated background light scales with excitation power. Based on these measurements, we identify characteristic spectral features and evaluate which fibers introduce the lowest fluorescence background in the NV centers' detection band.

Our results provide practical guidelines for selecting optimal optical fibers for NV-based quantum sensors and offer insights applicable to a broader field of fiber-coupled fluorescence-based sensors.

Keywords: Autofluorescence; NV center; Sensing; Optical fiber