Spatiotemporal control of polarized terahertz waves based on vector holography in photoreactive liquid crystals

• Project/Area Number: 15H05523
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Electron device/Electronic equipment
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Sasaki Tomoyuki 長岡技術科学大学, 工学研究科, 准教授 (90553090)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥22,880,000 (Direct Cost: ¥17,600,000、Indirect Cost: ¥5,280,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2015: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
• Keywords: テラヘルツ波 / 液晶 / ベクトルホログラフィ / テラヘルツ/赤外材料・素子

Outline of Final Research Achievements

We fabricated liquid crystal cells with transparent electrodes and investigated the transmittance spectra in the terahertz (THz) spectral range. The results demonstrated that liquid crystals are useful media for realizing active THz devices. We also investigated optically tunable THz polarization converters using dye-doped liquid crystals. The polarization conversion properties of the dye-doped liquid crystal cells could be controlled using the laser beam irradiation. The fact suggests that the polarization state of THz waves can be modulated spatiotemporally using liquid crystals and vector holography.

Research Products

• [Journal Article] Twisted nematic liquid crystal cells with rubbed poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) films for active polarization control of terahertz waves (2017)
  • Author(s): T. Sasaki, H. Okuyama, M. Sakamoto, K. Noda, H. Okamoto, N. Kawatsuki, and H. Ono
  • Journal Title: Journal of Applied Physics Volume: 121 Issue: 14 Pages: 143106-143106
  • DOI: 10.1063/1.4981244
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Universal polarization terahertz phase controllers using randomly aligned liquid crystal cells with graphene electrodes (2015)
  • Author(s): T. Sasaki, K. Noda, N. Kawatsuki, and H. Ono
  • Journal Title: Optics Letters Volume: 40 Issue: 7 Pages: 1544-1547
  • DOI: 10.1364/ol.40.001544
  • Peer Reviewed
• [Presentation] ツイストネマチック液晶セルによるテラヘルツ波の偏波制御 (2017)
  • Author(s): 奥山大樹、坂本盛嗣、野田浩平、川月喜弘、小野浩司、佐々木友之
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2017-03-14
• [Presentation] 色素ドープ液晶セルを用いた可視光によるテラヘルツ偏波の制御 (2017)
  • Author(s): 奥山大樹、坂本盛嗣、野田浩平、川月喜弘、小野浩司、佐々木友之
  • Organizer: Optics & Photonics Japan 2017
• [Presentation] ワイヤーグリッド電極を用いた液晶セルによる電圧制御型テラヘルツアッテネータ (2017)
  • Author(s): 串田裕紀、坂本盛嗣、野田浩平、岡本浩行、小野浩司、佐々木友之
  • Organizer: Optics & Photonics Japan 2017
• [Remarks] Electromagnetic Wave Control Device Laboratory
  • URL: http://hertz.nagaokaut.ac.jp/
• [Remarks] 電磁波制御デバイス研究室
  • URL: http://hertz.nagaokaut.ac.jp/