Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 17: Quantum Dots and Wires 4: Devices
HL 17.5: Talk
Wednesday, September 7, 2022, 10:30–10:45, H32
Optical properties of semiconductor quantum dots embedded in an open, fiber-based cavity emitting in the telecom regime — •Julia Wecker1, Thomas Herzog1, Jonas Grammel2, Ponraj Vijayan1, Robert Sittig1, Michael Jetter1, Simone Luca Portalupi1, David Hunger2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Stuttgart, Germany — 2Physikalisches Institut, Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
Enhancing the brightness of quantum emitters can be achieved by coupling them to optical microcavities. Together with an enhanced light extraction, shortening of the spontaneous emission rate can be achieved via the Purcell effect. In this work, we investigate In(Ga)As quantum dots embedded in an open fiber-based Fabry-Pérot cavity. On the bottom distributed Bragg reflector, quantum dots operating at the telecom O- and telecom C-Band are grown, while the top mirror is deposited on a silica fiber which can be moved with nanometric precision across the sample. Therefore, the cavity mode can be tuned in order to achieve spatial and spectral matching with the investigated emitter. The emitted photons are then directly coupled into the telecom fiber, making this fiber-coupled single-photon source promising for quantum communication applications.