Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Quantum Dots and Wires 5: Optics 2

HL 26.1: Talk

Thursday, September 8, 2022, 09:30–09:45, H32

All-optical polarization control of single photons emitted by a quantum dot — •Björn Jonas, Dirk Heinze, Eva Schöll, Patricia Kallert, Timo Langer, Sebastian Krehs, Alex Widhalm, Klaus D. Jöns, Dirk Reuter, Stefan Schumacher, and Artur Zrenner — Paderborn University, Physics Department, Warburger Straße 100, 33098 Paderborn, Germany

In our work we employ an all-optical approach based on nonlinear principles to control the polarization of single photon emission from a single quantum dot. To achieve this, we make use of a nonlinear down-conversion process from the biexciton to the ground state [1]. This opens an alternative decay path in addition to the biexciton cascade. Previous theoretical work suggests the possibility to manipulate the properties of the emitted photons by tuning the respective properties of a control laser [2].
By exploiting this mechanism, we were able to demonstrate polarization control of the emitted photons for linear and circular polarization. Our findings show no influence of the fine-structure splitting on the polarization of the emitted photons. We furthermore present a theoretical model to describe our results and we find excellent agreement between experiment and theory.
[1] B. Jonas et al., Nature Communications 13, 1387 (2022)
[2] D. Heinze et al., Nature Communications 6, 8473 (2015)