| Project/Area Number |
25247049
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OKAMOTO Hiroshi 東京大学, 新領域創成科学研究科, 教授 (40201991)
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| Co-Investigator(Kenkyū-buntansha) |
YADA Hiroyuki 東京大学, 大学院新領域創成科学研究科, 助教 (60573144)
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| Co-Investigator(Renkei-kenkyūsha) |
HORIUCHI Sachio 産業技術総合研究所, フレキシブルエレクトロニクス研究センター, チーム長 (30371074)
KANODA Kazushi 東京大学, 大学院工学系研究科, 教授 (20194946)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥35,100,000 (Direct Cost: ¥27,000,000、Indirect Cost: ¥8,100,000)
Fiscal Year 2015: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2014: ¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
Fiscal Year 2013: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
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| Keywords | 光物性 / フェムト秒レーザー / 誘電体物性 / テラヘルツ分光 / 分子性固体 / テラヘルツ電磁波 / 有機強誘電体 / フェムト秒レーザー分光 |
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| Outline of Final Research Achievements |
In this study, by using a terahertz electric-field pulse, we succeeded in controlling ferroelectric polarizations in the sub-picosecond time scale in electronic-type organic ferroelectrics (TTF-CA, α-(ET)2I3, and croconic acid), in which their polarizations originate from intra- or inter-molecular π-electrons transfers. Moreover, in the paraelectric phase of TTF-CA, we showed that a terahertz electric field gives rise to a large polarization, which reaches about 20 % of the polarization in its ferroelectric phase. We also demonstrated that these rapid and large responses of the polarizations are characteristic of electronic-type dielectrics. Our method of polarization controls using terahertz pulses presented in this study can be utilized for rapid optical modulation and optical switching, so that related studies will be extensively performed.
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