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HL: Fachverband Halbleiterphysik
HL 27: Quantum Dots and Wires: Optics II
HL 27.4: Talk
Wednesday, March 20, 2024, 10:15–10:30, EW 202
Investigation of Purcell Enhancement of Telecom-Wavelength Semiconductor Quantum Dots in Open Cavities — •Nam Tran1, Julian Maisch1, Jonas Grammel2, Julia Wecker1, Thomas Herzog1, Robert Sittig1, Ponraj Vijayan1, 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, — 2Physikalisches Institut, Karlsruher Institut für Technologie (KIT), Karlsruhe,
Single photon sources operating at telecom wavelength play a central role in quantum information, in particular when long-distance implementations are targeted. Highly promising candidates are semiconductor quantum dots (QD). Cavity quantum electrodynamics is often used to tailor the emission properties and, in case of photon sources, enhance their performances. However, limiting factors like spatial and spectral mismatch can be detrimental to the cavity-emitter interaction. Using open, tunable fiber cavities one can overcome these limitations. Here, we made a thorough investigation on how the ratio between the cavity and emitter linewidth, and unwanted mechanical vibrations can affect the achievable Purcell factor in open fiber/ semiconductor cavities embedding semiconductor QDs emitting in the telecom O- and C-band. Moreover, deterministic positioning of individual QDs enables the direct comparison of the optical properties within and outside the cavity.
Keywords: Semiconductor Quantum Dots; Fiber Cavity; Cavity electrodynamics; Single photon device; Quantum technology