Control of terahertz electromagnetic waves by ferroelectrics metamaterials

• Project/Area Number: 25287072
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Shinshu University
• Principal Investigator: TAKEDA Mitsuo 信州大学, 理学部, 教授 (20115653)
• Co-Investigator(Kenkyū-buntansha): MIYAMARU Fumiaki 信州大学, 学術研究院理学系, 准教授 (20419005) ; NAKATA Yousuke 信州大学, 先鋭領域融合研究群環境・エネルギー材料研究所, 助教 (50745205)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000); Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2014: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2013: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
• Keywords: メタマテリアル / 強誘電体 / ソフトフォノン / 群速度異常モード / フォノン・ポラリトン / テラヘルツ時間領域分光 / 電磁誘起透明化現象 / フォノン・ポラリトン分散関係 / ソフトフフォノン / フォノンポラリトン分散関係

Outline of Final Research Achievements

To emerge hybrid bands where coupling between photonic band and phonon-polariton in ferroelectrics are coupled, we fabricated the photonic crystals by stacking ferroelectrics plates. From terahertz transmission spectra, resonant frequencies, damping constants, and oscillator strengths of polar phonons were determined and lattice parameters for the photonic crystals where the hybrid band must exist were estimated. Spatial distributions of electric field of the group-velocity anomaly modes whose resonant frequencies are located in the vicinity of edges of band gaps were analyzed by means of finite element method. Electric fields of the modes are localized around the first to third layers near the incident side , while those of standing wave modes are localized at each layer constructing the photonic crystal. Moreover, we discussed possibility of anomalous transmission similar to electromagnetically induced transparency by using defect modes and the polar phonon in ferroelectrics.

Research Products

• [Journal Article] Ultrafast optical control of group delay of narrow-band terahertz waves (2014)
  • Author(s): F.Miyamaru, H. Morita, Y. Nishiyama, T. Nishida, T. Nakanishi, M. Kitano, and M. W. Takeda
  • Journal Title: Scientific Reports Volume: 4
  • Peer Reviewed
• [Presentation] Group-Velocity Anomaly Modes in Hybrid Bands in Photonic Crystals Made of Ferroelectrics (2016)
  • Author(s): M. W. Takeda, Akihiko Arikawa, Ryohei Araki, Yosuke Nakata, Fumiaki Miyamaru, and Toshihisa Yamaguchi
  • Organizer: CIMTEC 2016-7th Forum on New Materials
  • Place of Presentation: イタリア ペルージャ
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] 強誘電体メタマテリアルによるテラヘルツ電磁波の制御 (2015)
  • Author(s): 武田三男
  • Organizer: 日本物理学会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-25
  • Invited
• [Presentation] メタマテリアルによる電磁誘起透明化現象の模擬および透明化メカニズム (2013)
  • Author(s): 森田博紀，西山洋平，宮丸文章，中西俊博，北野正雄，武田三男
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 徳島県徳島市，徳島大学 常三島キャンパス
• [Presentation] Mechanism Of Electromagnetically Induced Transparency Like Phenomena With Metamaterials In Terahertz Region (2013)
  • Author(s): Hiroki Morita, Youhei Nishiyama, Fumiaki Miyamaru, Toshihiro Nakanishi, Masao Kitano, Mitsuo Takeda
  • Organizer: The International Conference on Infrared, Millimeter and Terahertz Waves 2013
  • Place of Presentation: Mainz, German
• [Remarks] 信州大学学術情報オンラインシステムSOAR
  • URL: http://www.shinshu-u.ac.jp/soar/
• [Remarks] Optical Physics Laboratory, Department of Physics
  • URL: http://science.shinshu-u.ac.jp/~thz
• [Remarks] Optical Physics Laboratory, Department of Physics
  • URL: http://science.shinshu-u.ac.jp/~thz/