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HL: Fachverband Halbleiterphysik
HL 34: Quantum Dots and Wires: Telecom Wavelength
HL 34.2: Vortrag
Mittwoch, 11. März 2026, 16:45–17:00, POT/0051
Telecom C-band Quantum Dots Coupled to Gaussian-shaped Microlens Cavities — •Michelle Pfahl1, Raphael Joos1, Lena Engel1, Johannes Michl2, Katharina Dahler1, Ponraj Vijayan1, Tobias Huber-Loyola2, Michael Jetter1, Simone L. Portalupi1, Sven Höfling2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart — 2Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Technische Physik, Am Hubland, 97074 Würzburg
Single-photon sources emitting in the telecom C-band are a key resource for applications in quantum communication and quantum cryptography, as they enable long-distance quantum networks. Semiconductor quantum dots (QDs) are particularly well suited for this since they have a high quality optical emission and can achieve high efficiency when coupled to microcavities. Here, we investigate telecom C-band InAs QDs, which are embedded in a resonator made of distributed Bragg reflectors (DBRs), with the upper dielectric DBR being shaped into Gaussian lenses using an etching process. This structure promises Purcell enhancement, which reduces the decay time of the QDs and enables efficient collection of the emitted photons. We investigate the optical modes of the resonators by an in-depth characterization of microlenses with different design parameters. Furthermore, the quantum-optical properties of the QDs coupled to cavities are analyzed by means of autocorrelation and decay time measurements.
Keywords: Quantum Dot; Telecom C-band; Microlens Cavity; Single Photons