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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.43: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Enhancement of Quantum Dot Emission in the Telecom C-Band via Photonic Micro Cavities — •Raphael Joos, Christian Rupp, Sascha Kolatschek, Stephanie Bauer, Cornelius Nawrath, Robert Sittig, Ponraj Vijayan, Michael Jetter, Simone Luca Portalupi, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Potential quantum technology applications such as quantum communication rely on the availability of carrier of quantum information. For that matter single-photons can be utilized as flying-qubits  imprinting information in their polarization state. For these applications it is beneficial to operate at the telecom C-band which offers reduced dispersion and minimum loss in optical fibers. In the recent years InAs quantum dots (QDs) have shown to be capable of emission of single and entangled photons in the telecom C-band. However, as-grown QD structures have limited collection efficiency of the emitted light due to total internal reflection. To tackle this issue photonic cavity structures can be employed which can enhance the photon extraction efficiency and decrease the decay time due the underlying Purcell effect. While there are different approaches to photonic structures ranging from planar cavities to Gaussian micro lenses, this work mainly deals with circular Bragg grating structures. These offer high collection efficiency in a broadband manner as well as a cavity spectrum which potentially allows simultaneous Purcell enhancement of exciton and biexciton.