Study on universal excitation of glassy materials by integrated terahertz-band spectroscopy and proposal of novel evaluation method for glass
| Project/Area Number |
17K14318
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | University of Tsukuba |
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Principal Investigator |
Mori Tatsuya 筑波大学, 数理物質系, 助教 (30598074)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | テラヘルツ / ガラス / 高分子ガラス / ボゾンピーク / フラクタル / フラクトン / ガラス形成物質 / ボソンピーク |
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| Outline of Final Research Achievements |
We demonstrated that terahertz time-domain spectroscopy can detect the boson peak which is one of the unsolved problems of glass physics. In particular, by combining the terahertz spectra and vibrational density of states determined from the low-temperature specific heat, the coupling coefficients for several network glasses and molecular glasses such as glucose glass were experimentally determined and fundamental knowledge on the interaction between THz light and the vibrational density of states of glassy materials was obtained. In addition, it was shown that the fractal dynamics considered to be universal excitation of polymer glass can be detected by terahertz spectroscopy by performing the formulation of the infrared light vibrational coupling constant for fracton region.
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| Academic Significance and Societal Importance of the Research Achievements |
テラヘルツ時間領域分光によって、ガラスの物理の未解決問題の一つである「ボゾンピーク」を検出できることを示した。これは非晶質物質全般のテラヘルツ帯ダイナミクスを理解するための基礎知見となる。また、物質の結晶化度をボゾンピーク強度を用いて非破壊・非接触にテラヘルツ光で決定できる新たなテラヘルツ光応用方法も提案した。さらに、高分子ガラスの励起であるフラクタルダイナミクスを如何にテラヘルツ光で検出できるかについて、線形応答理論を用いて示した。これは高分子ガラスのテラヘルツスペクトルの普遍的な側面を理解するための基礎知見となる。
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Report
(3 results)
Research Products
(78 results)
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[Presentation] Boson peak dynamics of densified silica glassprobed by terahertz time-domain spectroscopy2018
Author(s)
Tatsuya Mori, Yasuhiro Fujii, Suguru Kitani, Koki Nakano, Norimasa Nishiyama, Yohei Onodera, Shinji Kohara, Atsunobu Masuno, Akitoshi Koreeda, Hitoshi Kawaji, Seiji Kojima
Organizer
ICG Annual Meeting 2018
Related Report
Int'l Joint Research
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[Presentation] Boson peak investigation of glassy materials by terahertz time-domain spectroscopy: As a complementary method of Raman scattering2017
Author(s)
Tatsuya Mori, Yasuhiro Fujii, Mikitoshi Kabeya, Yuta Iijima, Wataru Yajima, Hirokazu Masai, Shinji Kohara, Suguru Kitani, Akitoshi Koreeda, Hitoshi Kawaji, Jae-Hyeon Ko and Seiji Kojima
Organizer
PRE'17（Photoluminescence in Rare Earths: Photonic Materials and Devices）
Related Report
Int'l Joint Research
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[Presentation] Boson peak investigation by terahertz time-domain spectroscopy: As a complementary method of Raman spectroscopy2017
Author(s)
T. Mori, Y. Fujii, S. Kitani, M. Kabeyta, K. Nakano, Y. Jiang, A. Koreeda, S. Kohara, N. Nishiyama, A. Masuno, Y. Yamamoto, H. Kawaji, S. Kojima
Organizer
THE 58th SYMPOSIUM ON GLASSES AND PHOTONIC MATERIALS
Related Report
Int'l Joint Research
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[Presentation] Boson peak and fracton behavior of lysozyme2017
Author(s)
Yue Jiang, Tatsuya Mori, Yasuhiro Fujii, Leona Motoji, Shunsuke Yoshizawa, Akitoshi Koreeda, Kentaro Shiraki, Yohei Yamamoto and Seiji Kojima
Organizer
TGSW-IWP2017 (TGSW-Interdisciplinary Workshop on Science and Patents 2017)
Related Report
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[Presentation] Boson peak detection of soda-lime glass by terahertz-band spectroscopy2017
Author(s)
Shota Hisano, Tatsuya Mori, Yasuhiro Fujii, Kenta Imoto, Byoung Wan Lee, Yuta Iijima, Hiroko Tokoro, Jae-Hyeon Ko, Akitoshi Koreeda, Shin-ichi Ohkoshi, and Seiji Kojima
Organizer
TGSW-IWP2017 (TGSW-Interdisciplinary Workshop on Science and Patents 2017)
Related Report
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