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HL: Fachverband Halbleiterphysik
HL 21: Quantum Nanophotonics in Solid State Systems
HL 21.6: Vortrag
Dienstag, 2. April 2019, 15:15–15:30, H33
Strain spectrally-tunable single photon source based on quantum dots in micropillar cavities — •Magdalena Moczała-Dusanowska1, Łukasz Dusanowski1, Stefan Gerhardt1, Yu-Ming He2, Marcus Reindl3, Armando Rastelli3, Rinaldo Trotta3,4, Christain Schneider1, and Sven Höfling1,5 — 1Technische Physik, Physikalisches Institut, Würzburg University, Germany — 2Hefei National Laboratory for Physical Sciences, University of Science and Technology of China, Hefei, China — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz, Austria — 4Department of Physics, Sapienza University of Rome, Italy — 5SUPA, School of Physics and Astronomy, University of St Andrews, UK
In this contribution we demonstrate results of emission tuning of QDs inserted in micropillar cavities. A sample containing an InAs/GaAs QDs embedded in a planar cavity based on Bragg reflectors has been integrated onto the PMN-PT piezo crystal. Subsequently micropillars have been fabricated by electron-beam lithography and reactive ion-etching. The application of an external stress produces roughly linear shifts of QDs emission which could be tuned into the resonance with fundamental cavity mode. Clear enhancement of QD emission have been observed and a Purcell factor as large as 4.43+/0.64 was extracted from time-resolved measurements based on strain tuning. Second-order autocorrelation histogram for pulsed resonant excitation with a π-pulse has been recorded, indicating high purity single-photon emission.