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Monochromatic thermal radiation from a dielectric microparticle

Research Project

Project/Area Number 17K05603
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Atomic/Molecular/Quantum electronics
Research InstitutionMeiji University

Principal Investigator

Tachikawa Maki  明治大学, 理工学部, 専任教授 (60201612)

Co-Investigator(Kenkyū-buntansha) 金本 理奈  明治大学, 理工学部, 専任准教授 (00382028)
小田島 仁司  明治大学, 理工学部, 専任教授 (50233557)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords熱放射 / 微粒子 / 光トラップ / 共振器QED / 放射圧
Outline of Final Research Achievements

This research project aims to clarify the size effects of thermal radiation from a dielectric microparticle.
Mie scattering theory predicts that thermal radiation becomes monochromatic on the surface phonon-polariton resonance when the emitting body shrinks into the submicron range. We first tried to observe IR spectrum of an optically trapped single particle, but our spectrometer was not sensitive enough to detect its weak signal. Switching to FTIR spectroscopy of particle ensembles, we have confirmed that submicron particles of silica and alumina thermally emit in the frequency range where thermal radiation from bulk materials is strongly restricted. Since surface phonon polaritons generally appear in the forbidden band, these FTIR spectra support the Mie theory. We also observed the Purcell effect, an enhancement of spontaneous emission of atoms inside a cavity, in thermal radiation spectrum of an optically trapped ruby microparticle.

Academic Significance and Societal Importance of the Research Achievements

熱放射のサイズ効果は、物質と電磁場の相互作用の基礎的な現象であるとともに、微小物体の熱計測にも関連するため応用上も重要である。しかし、大きさと形を指定した微小体からの信号を感度良く検出する実験の難しさから、これまでほとんど検証されてこなかった。
我々は、光トラップを利用した独自の実験系により、ミクロンサイズの誘電体の熱放射に放射体の共振モードの影響が現れることを明らかにした。さらに今回の成果は、サブミクロン領域において、熱放射が格子振動に起因する周波数に単色化することを明らかにしており、放射体が縮小するにつれて、熱放射スペクトルに放射体の個性が現れる過程とその機構を明確にすることができた。

Report

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

    (9 results)

All 2020 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Int'l Joint Research] Paris 13 University(フランス)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Mode-selective thermal radiation from a microsphere as a probe of optical properties of high-temperature materials2017

    • Author(s)
      R. Morino, H. Tajima, H. Sonoda, H. Kobayashi, R. Kanamoto, H. Odashima, and M. Tachikawa
    • Journal Title

      Physical Review A

      Volume: 95 Issue: 6

    • DOI

      10.1103/physreva.95.063814

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 光トラップが解き明かす微小な物体からの熱放射2020

    • Author(s)
      立川真樹、小田島仁司
    • Organizer
      レーザー学会学術講演会 第40回年次大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Morphology-dependent thermal radiation from micron- and submicron-sized dielectric particles2018

    • Author(s)
      M. Tachikawa, H. Odashima, R. Kanamoto, H. Tajima, and R. Morino
    • Organizer
      The 26th International Conference on Atomic Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quantum reflection of ultracold atoms by a spherical surface2018

    • Author(s)
      T. Yamaguchi, R. Kanamoto, and D. Akamatsu
    • Organizer
      The 26th International Conference on Atomic Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical trapping of ice crystals and its application in cloud physics2018

    • Author(s)
      M. Tachikawa and K. Nakao
    • Organizer
      The 45th Annual European Meeting on Atmospheric Studies by Optical Methods
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] ルビー微粒子からの熱放射におけるPurcell効果2018

    • Author(s)
      高橋和裕, 竹井敦史, 井上和宏, 竹澤隼, 小田島仁司, 立川真樹
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 低励起領域に於ける自律振動子集団の振幅ダイナミクス2017

    • Author(s)
      石橋健太,金本理奈
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 雷雲の発生機構解明のための氷晶の光トラッピング2017

    • Author(s)
      中尾晃太郎,原尾俊行,立川真樹
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Research-status Report

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

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