Dual-comb-based asynchronous pump-probe measurement with an ultrawide temporal dynamic range for characterization of photo-excited InAs quantum dots

Akifumi Asahara, Yuto Arai, Tomohiro Saito, Junko Ishi-Hayase, Kouichi Akahane, Kaoru Minoshima

Research output: Contribution to journalArticle

Abstract

A dual-comb-based asynchronous optical sampling (ASOPS) pump-probe measurement system is demonstrated for characterizing the relaxation dynamics in a photo-excited self-Assembled InAs quantum dot (QD) semiconductor. Although the photo-excited QD material has multiple complex relaxation processes, the transient transmittance responses (from femtoseconds to nanoseconds) are successfully obtained within a sub-second short acquisition time by using the ASOPS system. This is achieved with high stability and an extremely wide temporal dynamic range of approximately 105. The utility of the developed system is demonstrated as a powerful and easy-To-use measurement tool for studying the complex photo-excited dynamics of QD materials.

Original languageEnglish
Article number062003
JournalApplied Physics Express
Volume13
Issue number6
DOIs
Publication statusPublished - 2020 Jun 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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