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Ultrafast and efficient radiative decay due to coupling of light and multi-componet excitons in semiconductor single crystal thin films

Research Project

Project/Area Number 19K03687
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionThe University of Shiga Prefecture

Principal Investigator

Ichimiya Masayoshi  滋賀県立大学, 工学部, 准教授 (00397621)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords励起子 / 超高速光学応答 / 非線形光学 / 薄膜成長 / 光物性 / 単結晶薄膜
Outline of Research at the Start

ミクロとマクロの中間サイズ領域にある半導体高品質微小系は、光波と分極波の長距離にわたる結合により、従来のナノ構造や塊状の結晶と比べて桁違いの高効率・超高速光学応答を示すことが近年明らかになってきた。さらに、エネルギー的に近接する複数の分極モードが存在する系では光を介した多成分分極の結合による光学応答増強効果の倍増が期待できるため、本研究では価電子帯が縮退している半導体を対象に、高品質薄膜作製法の確立及び非線形光学応答の測定を行うことによって数10フェムト秒(1フェムト秒=1000兆分の1秒)級の超高速光学応答実現を目指す。

Outline of Final Research Achievements

We measured the degenerate four-wave mixing for high-quality ZnO thin films, and succeeded in observing a huge radiation shift that surpasses CuCl and an ultrafast nonlinear optical response of less than 100 fs. It was clarified that it was due to the interaction of the two excitons via light due to the fact that they were. In addition, the CuBr and CuI thin films formed on the CaF2 (111) substrate have a narrow XRD spectrum comparable to that of the powder sample, and succeeded in confirming that the single crystal structure has expanded to the order of 10 micrometer.

Academic Significance and Societal Importance of the Research Achievements

本研究では、単結晶薄膜の高品質化によって位相緩和時間を長くすることに加え、ナノとバルクのクロスオーバー領域特有の光-励起子コヒーレント結合効果によって輻射緩和時間を極端に短くすることによって光学応答における輻射緩和特性が支配的になるとのアイデアに基づいている。これは、複雑な構造や機構に頼りがちな半導体材料の高機能化において、単純な構造で結晶の品質を高めるのみによってトレードオフの関係にあるとされてきた光学非線形性増大と超高速応答を両立させる試みとして独自性があり、光デバイス開発におけるブレイクスルーとなることが期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2022 2020 2019

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

  • [Journal Article] Temperature dependences of photoluminescence intensities observed from AgInGaS and AgInGaS/GaSx core-shell nanoparticles2020

    • Author(s)
      Masayoshi Ichimiya, Tatsuya Kameyama, Tsukasa Torimoto, Taro Uematsu, Susumu Kuwabata, Masaaki Ashida
    • Journal Title

      Journal of Nanophotonics

      Volume: 14 Issue: 01 Pages: 016010-016010

    • DOI

      10.1117/1.jnp.14.016010

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ultrafast thermal-free photoluminescence of coherently extended single quantum states2019

    • Author(s)
      Takuya Matsuda, Masayoshi Ichimiya, Masaaki Ashida, Hajime Ishihara
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 8453-8453

    • DOI

      10.1038/s41598-019-44940-7

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Synergetic Enhancement of Light-Matter Interaction by Nonlocality and Band Degeneracy in ZnO Thin Films2019

    • Author(s)
      T. Kinoshita, T. Matsuda, T. Takahashi, M. Ichimiya, M. Ashida, Y. Furukawa, M. Nakayama, and H. Ishihara
    • Journal Title

      Physical Review Letters

      Volume: 122 Issue: 15 Pages: 157401-157401

    • DOI

      10.1103/physrevlett.122.157401

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] MBE 法による CuCl 量子ナノ構造の作製および光学評価2022

    • Author(s)
      伊藤 陸,一宮正義,柳沢淳一
    • Organizer
      ナノ学会第20回大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] MBE法によるSi基板上への高品質CuCl薄膜成長2020

    • Author(s)
      市川紗梨菜,一宮正義,柳沢淳一
    • Organizer
      ナノ学会第18回大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Ultrafast optical response due to radiative coupling of multicomponent excitons in ZnO thin films2019

    • Author(s)
      Masayoshi Ichimiya
    • Organizer
      EMN Epitaxy 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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