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Experimental Demonstration of Optical Cloaking

Research Project

Project/Area Number 19H02624
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 30020:Optical engineering and photon science-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Kajikawa Kotaro  東京工業大学, 工学院, 教授 (10214305)

Co-Investigator(Kenkyū-buntansha) 下条 雅幸  芝浦工業大学, 工学部, 教授 (00242313)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
Keywordsメタマテリアル / クローキング
Outline of Research at the Start

クローキングとは、物体を特定の媒質で覆い全体を不可視化する光学技術である。これまで理論と計算でしか議論されてこなかった光学周波数でのクローキングを実験により実証する。実在物質を使ったクローキング条件を提案し、数値計算による計算機実験を行う。そして、実際にクローキングが起こる構造を実際に作製し、実験でクローキングを観測する。2つのクローキング方法について研究を行う。1つめは座標変換光学に基づく方法であり、対象物の周りを屈折率分布をもつ媒質で覆い、光を迂回させて対象物を不可視化する。もう一つは対象物の分極を打ち消す方法である。打ち消された結果、分極がゼロとなり、散乱や反射が生じず不可視化される。

Outline of Final Research Achievements

Cloaking is an optical technique to make an object invisible by coating it with a specific medium. We have succeeded in experimentally demonstrating cloaking at optical frequencies that have only been discussed theoretically and computationally. Specifically, they performed theoretical calculations and experiments on the structure of silver nanowires (0.11 micrometer in diameter and 20 micrometers in length) coated with molybdenum oxide as a cloaking medium and found that when coated with a 0.045-micrometer-thick molybdenum oxide, cloaking was achieved for TM polarization, and that light scattering is virtually eliminated.

Academic Significance and Societal Importance of the Research Achievements

クローキングとは、物体(対象物)を特定の媒質で覆うことによりそれを不可視化する光学技術であり、これまで理論と計算でしか議論されてこなかった光学周波数でのクローキングを実験で実証することに成功した。金属や誘電体、半導体の円柱状のワイヤーを不可視化できるため、透明な電気配線材料や光導波路、光ファイバーなどが実現でき、光インターコネクションなどの集積回路の分野への波及効果が期待できる。

Report

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

    (42 results)

All 2022 2021 2020 2019 Other

All Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 9 results,  Open Access: 5 results) Presentation (32 results) (of which Int'l Joint Research: 12 results,  Invited: 6 results) Remarks (1 results)

  • [Journal Article] Investigation of polyesters as daytime radiative cooling materials2022

    • Author(s)
      Tam Hoang Thi Thanh、Toma Mana、Kajikawa Kotaro
    • Journal Title

      Molecular Crystals and Liquid Crystals

      Volume: N/A Issue: 1 Pages: 1-7

    • DOI

      10.1080/15421406.2022.2038458

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Extraordinary transmission of gold-capped sphere arrays in mid-infrared range2021

    • Author(s)
      Thanh Tam Hoang Thi、Kajikawa Kotaro
    • Journal Title

      Optics Express

      Volume: 29 Issue: 22 Pages: 35191-35191

    • DOI

      10.1364/oe.439357

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A visible and near-infrared broadband light absorber of cone-shaped metallic cavities2020

    • Author(s)
      Yuki Nakamura, Mana Toma, Kotaro Kajikawa
    • Journal Title

      Applied Physics Express

      Volume: 13 Issue: 6 Pages: 062001-062001

    • DOI

      10.35848/1882-0786/ab8964

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Design by neural network of concentric multilayered cylindrical metamaterials2020

    • Author(s)
      Naoto Akashi, Mana Toma , and Kotaro Kajikawa
    • Journal Title

      Applied Physics Express

      Volume: 13 Issue: 4 Pages: 042003-042003

    • DOI

      10.35848/1882-0786/ab7cf1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cylindrical hyperbolic metamaterials exhibiting superscattering with whispering gallery-like resonance2020

    • Author(s)
      Kumar Rahul、Kajikawa Kotaro
    • Journal Title

      Proceeding of SPIE

      Volume: 11289 Pages: 1128911-1128911

    • DOI

      10.1117/12.2543110

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superscattering from cylindrical hyperbolic metamaterials in the visible region2020

    • Author(s)
      Kumar Rahul、Kajikawa Kotaro
    • Journal Title

      Optics Express

      Volume: 28 Issue: 2 Pages: 1507-1507

    • DOI

      10.1364/oe.379547

    • NAID

      120006801912

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Broadband light absorber of gold-coated moth-eye film2019

    • Author(s)
      Kobayashi Mariko、Katori Yuki、Yamaguchi Masatoshi、Shimojo Masayuki、Kajikawa Kotaro
    • Journal Title

      Optical Materials Express

      Volume: 9 Issue: 9 Pages: 3744-3744

    • DOI

      10.1364/ome.9.003744

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Broadband light absorber property of metal-coated pillars on cicada wings2019

    • Author(s)
      Kobayashi Mariko、Furusawa Takaya、Chikuta Taiki、Shimojo Masayuki、Kajikawa Kotaro
    • Journal Title

      Optical Materials Express

      Volume: 9 Issue: 7 Pages: 2761-2761

    • DOI

      10.1364/ome.9.002761

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effective medium and equivalent circuit analysis of extraordinary transmission through metallic grating in the infrared range2019

    • Author(s)
      Kiyota Kengo、Kajikawa Kotaro
    • Journal Title

      OSA Continuum

      Volume: 2 Issue: 5 Pages: 1639-1639

    • DOI

      10.1364/osac.2.001639

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 放射冷却を使った熱電モジュールによる環境発電2022

    • Author(s)
      伊藤有輝、當麻 真奈、梶川 浩太郎
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 遺伝的アルゴリズムとニューラルネットワークを用いた光学クローキング設計2022

    • Author(s)
      百瀬 智也、當麻 真奈、梶川 浩太郎
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 比色型プラズモンバイオセンサによる生体分子の直接検出2022

    • Author(s)
      並原慎之輔、梶川 浩太郎、當麻 真奈
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 金属ナノピラーアレイのプラズモニック色2022

    • Author(s)
      杉本陽祐、當麻 真奈、梶川 浩太郎
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Transparent non-radiative cooling materials2022

    • Author(s)
      Hoang ThiThanh Tam, Mana Toma, Kotaro Kajikawa
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] クローキングによる単一銀ナノワイヤの不可視化2022

    • Author(s)
      碇 真一,當麻 真奈,梶川 浩太郎
    • Organizer
      第18回プラズモニクスシンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 光学クローキング設計における機械学習と遺伝的アルゴリズムの比較2021

    • Author(s)
      百瀬 智也、當麻 真奈、梶川 浩太郎
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 放射冷却を使った熱電モジュールによる発電2021

    • Author(s)
      伊藤有輝、當麻 真奈、梶川 浩太郎
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 比色型プラズモニックバイオセンサーを目指した高感度な銀ナノドーム構造2021

    • Author(s)
      當麻 真奈、板倉雄士、梶川 浩太郎
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 銀ナノドーム配列によるプラズモニック色の入射角度依存性2021

    • Author(s)
      杉本陽祐、當麻 真奈、梶川 浩太郎
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Mid-infrared extraordinary transmission through gold-covered dielectric microsphere monolayer2021

    • Author(s)
      Hoang ThiThanh, Kotaro Kajikawa
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Direct immunoassay by colorimetric plasmonic biosensor utilizing Ag nanodome arrays2021

    • Author(s)
      Shinnosuke Namihara, Mana Toma, and Kotaro Kajikawa
    • Organizer
      Korea-Japan Joint Forum on Organic Materials for Electronics and Photonics (KJF-ICOMEP)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Plasmonic color generation by Ag nanopillar arrays2021

    • Author(s)
      Yosuke Sugimoto, Mana Toma, and Kotaro Kajikawa
    • Organizer
      Korea-Japan Joint Forum on Organic Materials for Electronics and Photonics (KJF-ICOMEP)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Power generation with thermoelectric modules using radiative cooling2021

    • Author(s)
      Yuki Ito, Mana Toma, and Kotaro Kajikawa,
    • Organizer
      Korea-Japan Joint Forum on Organic Materials for Electronics and Photonics (KJF-ICOMEP)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polyethylene Terephthalate (PET) film for daytime radiative cooling2021

    • Author(s)
      Hoang Thi Thanh Tam, Mana Toma, and Kotaro
    • Organizer
      Korea-Japan Joint Forum on Organic Materials for Electronics and Photonics (KJF-ICOMEP)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A transparent fluoropolymer for daytime radiative cooling2021

    • Author(s)
      Hoang ThiThanhTam, Mana Toma, Takayuki Okamoto, Mio Hidaka, Kensuke Fujii, Yasuhiro Kuwana, Kotaro Kajikawa
    • Organizer
      The 11th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META2011)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Waveguiding of Radiation from Silica Plates2021

    • Author(s)
      Kotaro Kajikawa
    • Organizer
      The 11th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META2011)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Transparent fluoropolymer for daytime radiative cooling2021

    • Author(s)
      Hoang ThiThanh Tam, Mana Toma, Takayuki Okamoto, Mio Hidaka, Kensuke Fujii, Yasuhiro Kuwana, Kotaro Kajikawa
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 光学設計への機械学習の応用2021

    • Author(s)
      梶川浩太郎
    • Organizer
      日本顕微鏡学会 第45回関東支部講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 銀ナノワイヤーのクローキングによる不可視化の実証2020

    • Author(s)
      小林 佑輔、當麻 真奈、岡野 瑛飛、下条 雅幸、梶川浩太郎
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 黒体メタサーフェスのための有効媒質近似2020

    • Author(s)
      中村 佑希、當麻 真奈、梶川 浩太郎
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ニューラルネットワークを用いたメタマテリアルの形状推定2020

    • Author(s)
      明石 直人、當間 真奈、梶川 浩太郎
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] モスアイフィルムを利用した黒体メタ表面2019

    • Author(s)
      中村佑希、當麻真奈、梶川浩太郎
    • Organizer
      電子情報通信学会 有機エレクトロニクス研究会(OME)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 機械学習を使ったメタマテリアルの設計2019

    • Author(s)
      梶川浩太郎
    • Organizer
      日本光学会ナノオプティクス研究グループ 第26回研究討論会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Design of metamaterials based on neural networks2019

    • Author(s)
      Kotaro Kajikawa
    • Organizer
      iSPN2019 The International Symposium on Plasmonics and Nanophotonics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Design of metamaterials using neural networks2019

    • Author(s)
      Naoto Akashi, Mana Toma, Kotaro Kajikawa
    • Organizer
      SPIE Photonics Asia
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ニューラルネットワークを用いたメタマテリアルの設計2019

    • Author(s)
      明石 直人、梶川 浩太郎、當麻 真奈
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Extraordinary transmission of gold-capped silica-sphere array2019

    • Author(s)
      Hoang Thi Thanh Tam, Kotaro Kajikawa
    • Organizer
      JSAP-OSA Joint Symposia 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Surface phonon polariton in silica for effective radiative cooling2019

    • Author(s)
      Kotaro Kajikawa
    • Organizer
      KJF International Conference on Organic Materials for Electronics and Photonics (KJF-ICOMEP 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Invisible Dielectric Cylinders at Optical Frequency2019

    • Author(s)
      Yusuke Kobayashi and Kotaro Kajikawa
    • Organizer
      A3 Metamaterials Forum
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Invisible Dielectric Cylinders at Optical Frequency2019

    • Author(s)
      Kotaro Kajikawa and Yusuke Kobayashi
    • Organizer
      META2019 10th International Conference on Metamaterials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ニューラルネットワークを使ったメタマテリアルの設計2019

    • Author(s)
      明石直人, 當麻真奈, 梶川浩太郎
    • Organizer
      第16回プラズモニクスシンポジウム
    • Related Report
      2019 Annual Research Report
  • [Remarks] Publications

    • URL

      http://www.opt.ip.titech.ac.jp/publications_j.html

    • Related Report
      2021 Annual Research Report

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

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