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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.57: Poster
Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof
A nanofabricated solid immersion lens for bright and high-purity single-photon emission from a germanium-vacancy center in diamond — •Justus Christinck1,2, Franziska Hirt1,2, Helmuth Hofer1, Markus Etzkorn2,3, Zhe Liu2,3, Toni Dunatov4, Milko Jakšić4, Jacopo Forneris5,6,7, and Stefan Kück1,2 — 1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany — 2Laboratory for Emerging Nanometrology (LENA), Braunschweig, Germany — 3Technische Universität Braunschweig, Braunschweig, Germany — 4Ruder Bošković Institute, Zagreb, Croatia — 5University of Torino, Torino, Italy — 6Istituto Nazionale di Fisica Nucleare (INFN), Torino, Italy — 7Istituto Nazionale di Ricerca Metrologica (INRiM)
The group IV-vacancy color centers in diamond, such as the germanium-vacancy (GeV) center, are potential candidates for quantum metrology applications at room temperature. We report on the fabrication of a GeV center doped diamond sample by implantation of Ge-ions and subsequent high-temperature vacuum annealing. To enhance the photon-extraction from the diamond, solid immersion lenses were fabricated into the diamond surface in a focused ion beam scanning electron microscope (FIB-SEM) setup. A bright GeV center in a solid-immersion lens was examined in terms of its saturation behavior and its single-photon purity through the measurement of the g(2)(τ) function. A saturation count rate at the detector of (833±9) kcps was reached. A simultaneous count rate of 580 kcps and g(2)(0)=(0.12±0.06) were measured in the experiment.