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Structural elaboration and external cavity control of semiconductor superlattices with room-temperature terahertz gain

Research Project

Project/Area Number 17H03232
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionNagaoka University of Technology

Principal Investigator

Unuma Takeya  長岡技術科学大学, 工学研究科, 准教授 (20456693)

Co-Investigator(Kenkyū-buntansha) 玉山 泰宏  長岡技術科学大学, 工学研究科, 准教授 (50707312)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Keywords半導体超格子 / テラヘルツ / 光学利得 / 量子ビート / トンネル効果 / 非平衡系 / 半導体物性 / 超格子 / テラヘルツ/赤外材料・素子
Outline of Final Research Achievements

For biased semiconductor superlattices (SLs) composed of GaAs-based materials, the spatial shape and distribution of electron wavefunctions dependent on their internal structures were found to be significant factors in the characteristics of terahertz gain versus temperature and bias electric field. In particular, this insight allowed us to quantitatively understand the spectral linewidth of terahertz gain originating from Bloch oscillations in an isolated SL miniband and also the phase shift of Bloch oscillations in the presence of strong interminiband interaction. In addition, we designed a metal-based metamaterial serving as both a planar electrode and an external cavity and introduced it into SL samples.

Academic Significance and Societal Importance of the Research Achievements

異なる半導体材料をナノレベルの厚さで周期的に積層させた半導体超格子について,室温でテラヘルツ電磁波の利得(増幅作用)があることに着目し,内部構造と外部構造の工夫によって利得を操るための新たな物理を提示した。電波と光の中間にあたるテラヘルツ電磁波の小型固体光源は様々な応用へ期待されているものの未だ発展途上にあるため,室温動作と周波数可変性を両立できる人工積層構造の長所を発展させたことに本研究の意義がある。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (9 results)

All 2019 2018 2017

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

  • [Journal Article] Generalized framework for determining time origin in terahertz emission spectroscopy on the basis of causality2019

    • Author(s)
      T. Unuma and K. Minami
    • Journal Title

      Optics Express

      Volume: 27 Issue: 4 Pages: 5136-5143

    • DOI

      10.1364/oe.27.005136

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phase shift of terahertz Bloch oscillations induced by interminiband mixing in a biased semiconductor superlattice2019

    • Author(s)
      T. Unuma and S. Maeda
    • Journal Title

      Applied Physics Express

      Volume: 12 Issue: 4 Pages: 041003-041003

    • DOI

      10.7567/1882-0786/ab0514

    • NAID

      210000135640

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temperature-dependent spectral linewidths of terahertz Bloch oscillations in biased semiconductor superlattices2018

    • Author(s)
      T. Unuma and A. Matsuda
    • Journal Title

      Applied Physics Letters

      Volume: 112 Issue: 16

    • DOI

      10.1063/1.5024342

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] ナノ構造半導体・有機半導体における弱局在電子系のテラヘルツ応答2019

    • Author(s)
      鵜沼毅也
    • Organizer
      強光子場科学研究懇談会 2018年度第3回懇談会(講演会)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Inversionless terahertz gain in semiconductor superlattices up to room temperature and above2018

    • Author(s)
      T. Unuma, A. Matsuda, A. Naka, and K. Hirakawa
    • Organizer
      The 9th International Symposium on Ultrafast Phenomena and Terahertz Waves
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ミニバンド間相互作用の強いGaAs/AlGaAs超格子におけるブロッホ振動の位相シフト2018

    • Author(s)
      前田秀平,鵜沼毅也
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ミニギャップの狭いGaAs系超格子におけるテラヘルツ放射の印加電圧依存性2018

    • Author(s)
      前田秀平,鵜沼毅也
    • Organizer
      日本物理学会第73回年次大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Room-temperature THz gain of biased semiconductor superlattices revealed by phase-sensitive measurements of Bloch oscillations2017

    • Author(s)
      Takeya Unuma, Akiyoshi Naka, and Kaz Hirakawa
    • Organizer
      The Twelfth Japan-Finland Joint Symposium on Optics in Engineering
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] GaAs系超格子におけるブロッホ振動の緩和時間の温度依存性2017

    • Author(s)
      松田亜玲歩,鵜沼毅也
    • Organizer
      平成29年度応用物理学会北陸・信越支部学術講演会
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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