Self-induced ultrafast electron-hole-plasma temperature oscillations in nanowire lasers

Thurn, Andreas, Bissinger, Jochen, Meinecke, Stefan, Schmiedeke, Paul, Oh, Sang Soon ORCID: https://orcid.org/0000-0003-3093-7016, Chow, Weng W., Lüdge, Kathy, Koblmüller, Gregor and Finley, Jonathan J. 2023. Self-induced ultrafast electron-hole-plasma temperature oscillations in nanowire lasers. Physical Review Applied 20 , 034045. 10.1103/PhysRevApplied.20.034045

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Abstract

Nanowire lasers can be monolithically and site-selectively integrated onto silicon photonic circuits. To assess their full potential for ultrafast optoelectronic devices, a detailed understanding of their lasing dynamics is crucial. However, the roles played by their resonator geometry and the microscopic processes that mediate energy exchange between the photonic, electronic, and phononic subsystems are largely unexplored. Here, we study the dynamics of GaAs-AlGaAs core-shell nanowire lasers at cryogenic tem- peratures using a combined experimental and theoretical approach. Our results indicate that these NW lasers exhibit sustained intensity oscillations with frequencies ranging from 160 GHz to 260 GHz. As the underlying physical mechanism, we have identified self-induced electron-hole plasma temperature oscilla- tions resulting from a dynamic competition between photoinduced carrier heating and cooling via phonon scattering. These dynamics are intimately linked to the strong interaction between the lasing mode and the gain material, which arises from the wavelength-scale dimensions of these lasers. We anticipate that our results could lead to optimised approaches for ultrafast intensity and phase modulation of chip-integrated semiconductor lasers at the nanoscale.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	2331-7019
Funders:	Deutsche Forschungsgemeinschaft (DFG), European Research Council (ERC), European Regional Development Fund (ERDF), U.S. Department of Energy
Date of First Compliant Deposit:	25 September 2023
Date of Acceptance:	3 August 2023
Last Modified:	28 Sep 2023 00:45
URI:	https://orca.cardiff.ac.uk/id/eprint/162704

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