"Single-photon emitters based on germanium-vacancy centers in solid immersion lenses in diamond" - Poster award of the 764th Heraeus-Seminar on Photonic Quantum Technologies for Justus Christinck

Solid immersion lenses (SILs) have the potential to enhance the single-photon emission properties of color centers in diamond, e.g., of germanium-vacancy (GeV-) centers, due to an increase of the photon extraction from the diamond. We present the successful generation of GeV-centers in bulk diamond, the fabrication of hemispherical SILs with GeV-centers using a focused ion beam (FIB) and the metrological characterization of the emission of the GeV-centers in SILs in terms of the spectral distribution, the single-photon purity, the saturation behavior, and the emitter’s excited state lifetime. We could verify a significant increase of the detector count rate for GeV-centers in SILs compared to those without a SIL. The singlephoton purity and detector count rate were measured for different excitation powers and were evaluated in a combined model. This allows the possibility to distinguish between the linear background emission and multiple GeV-centers in a SIL.

This poster won the 2nd place at the poster award of the 764th Heraeus-Seminar on Photonic Quantum Technologies.

Link to Poster (1.50 MB)

Authors:
Christinck, Justus; 4.5, Angewandte Radiometrie, PTB-Braunschweig; Laboratory for Emerging Nanometrology, Braunschweig, Germany
Hirt, Franziska; 4.5, Angewandte Radiometrie, PTB-Braunschweig; Laboratory for Emerging Nanometrology, Braunschweig, Germany
Hofer, Helmuth; 4.5, Angewandte Radiometrie, PTB-Braunschweig
Liu, Zhe; TU Braunschweig; Laboratory for Emerging Nanometrology, Braunschweig, Germany
Etzkorn, Markus; TU Braunschweig; Laboratory for Emerging Nanometrology, Braunschweig, Germany
Dunatov, Toni; Ruđer Bošković Institute, Zagreb, Croatia
Jakšić, Milko; Ruđer Bošković Institute, Zagreb, Croatia
Forneris, Jacopo; University of Torino, Torino, Italy
Kück, Stefan; 4, Optik;  PTB-Braunschweig; Laboratory for Emerging Nanometrology, Braunschweig, Germany