Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 57: Quantum Dots and Wires: Optics II
HL 57.12: Talk
Friday, March 21, 2025, 12:30–12:45, H13
Efficient fiber coupling of telecom single photons from circular Bragg gratings — •Nam Tran1, Pavel Ruchka2, Sara Jakovljevic2, Benjamin Breiholz1, Peter Gierß1, Ponraj Vijayan1, Carlos Eduardo Jimenez3, Alois Herkommer3, Michael Jetter1, Simone Luca Portalupi1, Harald Giessen2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart — 24. Physikalisches Institut, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart — 3Institut für Technische Optik, Research Center of Photonic Engineering, SCoPE, University of Stuttgart
This work aims at quantitatively investigating the spatial stability and coupling efficiency of telecom C-band photons, generated by an epitaxial quantum dot embedded in a circular Bragg grating, into single mode optical fibers. These results are then compared to a bare single mode fiber without the 3D printed lens and a collection via a microscope objective. In terms of the total fiber coupling efficiency, the lensed and bare fiber outperform the microscope objective by up to a factor of 2.9 corresponding to a measured count rate at the detectors of 0.44MHz and 1.11MHz, respectively. The lateral (vertical) displacement showed that within a few (a few tenths) of microns the coupling degrades less than a factor of two.
Keywords: Semiconductor; Single photon emitter; Fiber; Circular Bragg grating; Telecom