Ultrafast carrier dynamics of surfactant-mediated-grown InAs/GaAs quantum-dot structures designed for THz applications

N. S. Daghestani, M. Alduraibi, T. Piwonski, T. Ochalski, G. Huyet, M. Missous, T. Ackemann, Maria Ana Cataluna

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Quantum-dot (QD) materials have shown great promise for THz photoconductive devices. The generation of THz radiation relies on the excitation of highly-mobile carriers with sub-picosecond lifetimes. The band structure of QD materials grown for such THz applications leads to a multitude of energy bands/levels [1], onto which carriers can be excited. Here we show for the first time that the lifetime of carriers excited into the GaAs barriers (λ=800 nm) is up to two orders of magnitude shorter than when these are excited resonantly within the QDs (λ=1245 nm). We also present annealed QD-structures which exhibit faster carrier lifetimes than as-grown ones for most pump conditions, a feature unreported so far. Furthermore, an increase of carrier lifetime with the incident pump power is also unveiled for both annealed and as-grown samples. This study has significant implications in the understanding and optimal use of QD materials for THz generation applications [2].

Original languageEnglish
Title of host publication2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference
ISBN (Electronic)978-1-4799-0594-2
Publication statusPublished - 2013
EventInternational Quantum Electronics Conference 2013 - Munich, Germany
Duration: 12 May 201316 May 2013


ConferenceInternational Quantum Electronics Conference 2013
Abbreviated titleIQEC 2013

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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