SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Poster Session IV
HL 19.29: Poster
Thursday, September 30, 2021, 13:30–16:30, P
Spin lasing in bimodal quantum dot micropillar cavities — •Niels Heermeier1, Tobias Heuser1, Jan Grosse1, Natalie Jung2, Markus Lindemann2, Nils Gerhard2, Martin Hofmann2, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Tech- nische Universiät Berlin, D-10623 Berlin, Germany — 2Lehrstuhl für Photonik und Terahertztechnologie, Fakulktät für Elektrotechik und Informationstechnik, Ruhr-Universität Bochum, D-44780 Bochum
Spin-controlled lasers are highly interesting photonic devices and have been shown to provide ultra-fast polarization dynamics in excess of 200 GHz. In contrast to conventional semiconductor lasers their tem- poral properties are not limited by the intensity dynamics, but are governed primarily by the birefringent mode splitting that determines the polarization oscillation frequency. Another class of modern semi- conductor lasers are high-beta emitters which benefit from enhanced light-matter interaction due to strong mode confinement in low-mode- volume microcavities. In such structures, the emission properties can be tailored by the resonator geometry to realize for instance bimodal emission behavior in slightly elliptical micropillar cavities. We utilize this attractive feature to demonstrate and explore spin-lasing effects in bimodal high-beta quantum dot micropillar lasers. The studied micro- lasers show spin laser effects with polarization oscillation frequencies up to 15 GHz which is controlled by the ellipticity of the resonator. Our results reveal appealing prospects for very compact and energy- efficient spin lasers and can pave the way for future purely electrically injected spin lasers enabled by short injection path lengths.