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Control of exciton characteristics towards realization of frequency tunable terahertz wave source(Fostering Joint International Research)

Research Project

Project/Area Number 16KK0129
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Electronic materials/Electric materials
Research InstitutionKobe University

Principal Investigator

Kojima Osamu  神戸大学, 工学研究科, 准教授 (00415845)

Project Period (FY) 2017 – 2019
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000)
Keywordsテラヘルツ電磁波 / 半導体 / 量子井戸 / 励起子 / 非線形光学 / 差周波混合 / テラヘルツ分光 / 多重量子井戸
Outline of Final Research Achievements

The purpose of this study was to clarify the role of excitons in the generation of terahertz electromagnetic waves by difference frequency mixing using excitons in semiconductors. The semiconductor samples were fabricated at the University of Glasgow, which is an international collaborator, and optical measurements, including observation of terahertz electromagnetic waves, were performed at Kobe University. From the experimental results obtained by the modulation spectroscopy, the second harmonic generation using the ultrashort pulse, and so on, the effects of resonant excitation of a single exciton level could be clarified. On the other hand, the effect of excitation of two exciton levels is still unknown. This point will be clarified in future research.

Academic Significance and Societal Importance of the Research Achievements

半導体中の励起子は高い振動子強度を有していることから、光デバイスへの応用が期待される一方、GaAsでは束縛エネルギーが小さく、室温で励起子が安定に存在できないとされてきた。そのような状況で、室温で励起子を利用したデバイスへの提案ができた点は重要な意義があると考えている。さらに、半導体レーザーとの組み合わせで小型のテラヘルツ電磁波分光システムを実現できると期待でき、有毒または有害な分子を高速に検出できる小型システムは今後、社会的に必要とされると考えている。

Report

(2 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (14 results)

All 2020 2019 2017 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Glasgow大学(英国)2017

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Electron transport in a silicon crystal observed by energy transfer luminescence2020

    • Author(s)
      Kojima Osamu、Yukako Ito、Kita Takashi、Shim Yong-Gu
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 8 Pages: 082005-082005

    • DOI

      10.35848/1347-4065/aba3f6

    • NAID

      120007140172

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of a thin nitrogen-doped layer on terahertz dynamics in GaAs containing InAs quantum dots2019

    • Author(s)
      Kojima Osamu、Izumi Ryo、Kita Takashi
    • Journal Title

      OSA Continuum

      Volume: 2 Issue: 5 Pages: 1621-1621

    • DOI

      10.1364/osac.2.001621

    • NAID

      120006621636

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of modulation of ultrafast transient carrier dynamics by interface on terahertz signal2019

    • Author(s)
      Yamamoto Shintaro、Kojima Osamu、Kita Takashi
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1220 Issue: 1 Pages: 012013-012013

    • DOI

      10.1088/1742-6596/1220/1/012013

    • NAID

      120006713581

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches2019

    • Author(s)
      Kojima Osamu、Nagauchi Junpei、Kita Takashi
    • Journal Title

      Journal of Applied Physics

      Volume: 126 Issue: 3 Pages: 033103-033103

    • DOI

      10.1063/1.5090831

    • NAID

      120006713585

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterisation of thin-layer resonant tunnelling diodes grown by MOVPE2019

    • Author(s)
      Razvan Baba, Osamu Kojima, Kristof JP Jacobs, Brett A Harrison, Ben J Stevens, Toshikazu Mukai, Richard A Hogg
    • Journal Title

      Proc. SPIE Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XVI

      Volume: 10929 Pages: 1092909-1092909

    • DOI

      10.1117/12.2510119

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] GaAs/AlAs多重量子井戸における連続波励起子共鳴励起による変調効果2020

    • Author(s)
      小島 磨、喜多 隆、Hogg Richard
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] GaAs/AlAs多重量子井戸における差周波混合によるテラヘルツ電磁波発生に対する励起子の重ね合わせ効果2020

    • Author(s)
      坂上 寛太、小島 磨、喜多 隆、Hogg Richard
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Extension of excitation energy to generate terahertz wave to smaller than GaAs bandgap energy due to growth of InAs quantum dots and nitrogen doped layer2019

    • Author(s)
      O. Kojima, T. Kita
    • Organizer
      Compound Semiconductor Week 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Control of exciton interference in GaAs/AlAs multiple quantum wells2019

    • Author(s)
      O. Kojima, T. Kita
    • Organizer
      SemiconNano2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GaAs/AlAs 多重量子井戸の励起子共鳴励起下での励起子分布2019

    • Author(s)
      小島 磨, 井山 華澄, 喜多 隆, R. Hogg
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Characterisation of thin-layer resonant tunnelling diodes grown by MOVPE2019

    • Author(s)
      R. Baba, O. Kojima, K. J. P. Jacobs, B. A. Harrison, B. J. Stevens, T. Mukai, R. A. Hogg
    • Organizer
      Photonic West 20019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 神戸大学フォトニック材料学研究室

    • URL

      http://www.research.kobe-u.ac.jp/eng-photonics/

    • Related Report
      2019 Annual Research Report
  • [Remarks]

    • URL

      http://www.research.kobe-u.ac.jp/eng-photonics/kojima/Kojima.htm

    • Related Report
      2019 Annual Research Report

URL: 

Published: 2017-03-15   Modified: 2021-02-19  

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