Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.15: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Quantum photonics using color centers in a diamond membrane coupled to a photonic structure — •Surena Fatemi1, Jan Fait1, Roy Konnoth Ancel2, Aurelie Broussier2, Philipp Fuchs1, Christophe Couteau2, and Christoph Becher1 — 1Fachrichtung Physik, Universität des Saarlandes, Campus E2.6, 66123, Saarbrücken, Germany — 2Light, nanomaterials, nanotechnologies (L2n), Université de Technologie de Troyes, 10004 Troyes, France
In recent years, color centers in wide band-gap materials have garnered significant attention for their exceptional properties in quantum technologies. Among these, group-IV color centers in diamonds are particularly promising due to their long spin coherence times and excellent optical characteristics, such as narrow emission lines, high spectral stability, and bright single-photon emission.
A major challenge in realizing quantum devices based on color centers is the inefficient out-coupling of photon emission from the diamond, leading to low extraction rates. To address this, we study group-IV color centers in diamond membranes coupled to TiO2-based photonic waveguides. Using Finite-Element-Method simulations and Monte-Carlo optimization, we optimize membrane geometry, coupling interfaces, and waveguide structures to enhance photon out-coupling and achieve high photon rates. The optimized structures will then be fabricated and experimentally characterized, enabling the practical implementation of efficient quantum devices.
Keywords: Diamond; Quantum Optics; Single-Photon Emitter; Tin-Vacancy; Photonic Waveguide