Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Poster – Quantum Technologies III
Q 66.29: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Femtosecond-Laser Written Waveguides and Surface Structures for High-Efficiency NV-Center Fluorescence Collection in Diamond — Andreas Giese1, Lucas Kirchbach1, Andreas Stute1, Stefan Nolte2, and •Bernd Braun1 — 1Technische Hochschule Nürnberg, Nuremberg, Germany — 2Friedrich-Schiller-Universität Jena, Jena, Germany
Nitrogen-vacancy (NV) centers in diamond are a promising platform for applications in optical quantum technologies such as quantum sensing and quantum computing. In addition to the precise and deterministic fabrication of NV centers in diamond using direct laser writing, efficient fluorescence collection is of crucial importance.
We investigate strategies for the enhancement of photon extraction from NV-centers in diamond. Directly laser written waveguides inside the diamond crystal enable efficient coupling and potential fiber-based detection for integrated photonic architectures. Numerical simulations support the experiments and are used for the optimization of the volume modifications. Further approaches for increasing the collected fluorescence are based on laser structuring of the diamond surface, for example through the fabrication of microlenses to enhance the extraction of emitted photons. These methods provide pathways toward highly efficient, scalable collection schemes for diamond-based quantum photonic devices.
Keywords: Diamond; Waveguide; Fluorescence; Femtosecond Laser; Nitrogen Vacancy