Control of Magnetic Properties in Nano- and Micro-scales with Large Optical Nonlinearity: a New Approach for Development of Functional Micromachines

具有大光学非线性的纳米和微米尺度磁特性控制：功能微机械开发的新方法

• 批准号: 17310068
• 负责人: TAKEDA Jun
• 金额: $ 9.84万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17310068/
• 关键词: Organic Radical; TTTA; Two-Photon Absorption; Photoinduced Phase Transition; Optical Nonlinearity; Magnetic Control; Micro-Machine

Since a large first order magnetic phase transition with a wide thermal hysteresis loop over wide temperature range was found in 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) crystal, an organic radical crystal is expected to be a new type of strong correlated electronic systems showing photoinduced phase transition (PIPT) phenomena. In this research, we explore how to control the magnetic properties of TTTA in nano- and micro-regions with large optical nonlinearity, and demonstrate a new approach for the development of functional nano and micromachines by utilizing the PIPT phenomena.Photoluminescence as well as photoinduced diamagnetic to paramagnetic phase transition in TTTA crystal has been studied in detail under two-photon absorption with different photon densities and wavelengths. Below the threshold photon density to drive the PIPT, the diamagnetic phase shows a broad luminescence band with a large Stokes shift, whose intensity obeys almost second power law of the excitation photon density. Above the threshold photon density, on the other hand, the diamagnetic to paramagnetic phase transition effectively takes place with a large conversion yield and a steep response instead of an occurrence of the photoluminescence, indicating that the phase transition is optically induced by two-photon absorption with large optical nonlinearity. Using the PIPT behavior with the large nonlinearity, the magnetic properties of TTTA can be controlled at room temperature.In order to develop the functional nano and micromachines, TTTA is distributed into UV curable resins, which are suitable for the production of 3D micromachines by using two-photon microstereolithography. We found that TTTA can be successfully distributed into the resins with keeping the PIPT characteristics by irradiation of intense laser pulses from a femtosecond regenerative amplifier.

由于在1,3,5-3,4,4,6-3-三氮杂苯基（TTTTA）晶体中发现有机自由基晶体有望是一种新型的强相关电子系统，显示出光诱导的相变（PIPT）iNAMENAMENAMENAL，因此发现有机自由基晶体在1,3,5-3-4,6-三酶苯基（TTTTA）晶体中发现了大型的热滞后回路，在宽温度范围内。 In this research, we explore how to control the magnetic properties of TTTA in nano- and micro-regions with large optical nonlinearity, and demonstrate a new approach for the development of functional nano and micromachines by utilizing the PIPT phenomena.Photoluminescence as well as photoinduced diamagnetic to paramagnetic phase transition in TTTA crystal has been studied in detail under two-photon absorption with different光子密度和波长。低于阈值光子密度以驱动PIPT，DiMagnetic阶段显示出具有较大的Stokes Shings的宽发光带，其强度遵守激发光子密度的几乎第二功率定律。另一方面，在阈值光子密度上方，磁磁相变到磁磁相转变的有效发生，并以较大的转化率和陡峭的响应进行，而不是光致发光的发生，表明该相变的含量是通过较大的光学非线性通过两光子吸收来光学诱导的。使用具有较大非线性的PIPT行为，可以在室温下控制TTTA的磁性特性。在开发功能性纳米和微型机器中，TTTA分布到紫外可固化的树脂中，该树脂适用于使用两光子微骨化石学，适合生产3D Micromachines。我们发现，可以通过从飞秒再生放大器中辐射强烈的激光脉冲来成功地将TTTA成功分布到树脂中，以保持PIPT特性。

项目成果

Time- and Frequency-resolved Two-dimensional Transient Absorption Imaging B-Carotene in Solids

固体中 B-胡萝卜素的时间和频率分辨二维瞬态吸收成像

• 期刊: Ultrafast Phenomena XV, Springer Series in Chemical Physics. (印刷中)(accepted)
• 作者: J.Takeda;Y.Makishima;A.Ishida
• 通讯作者: A.Ishida

光物性の基礎と応用

光学物理基础与应用

• 发表时间: 2006
• 作者: M.Sugisaki;T.Sashima;K.Yanagi;A.Sugita;H.Hashimoto;杉崎 満 他
• 通讯作者: 杉崎 満 他

Femtosecond real-time pump-probe imaging spectroscopy implemented on a single shot basis

• DOI: 10.1143/jjap.45.5986
• 发表时间: 2006-07-01
• 期刊: JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
• 作者: Makishima, Yoshinori;Furukawa, Naoki;Takeda, Jun
• 通讯作者: Takeda, Jun

Luminescence Properties and Relaxation Processes of Strongly Correlated Organic Radical 'ITTA Crystals and Molecules

强相关有机自由基ITTA晶体和分子的发光性质和弛豫过程

• 发表时间: 2008
• 期刊: Journal of Luminescence 128
• 作者: H. Suzuki;et. al.
• 通讯作者: et. al.

Direct Visualization of Transient Absorption by Real-Time Pump-Probe Imaging Spectroscopy

通过实时泵浦探针成像光谱直接可视化瞬态吸收

• 发表时间: 2004
• 期刊: Ultrafast Phenomena(Springer, Tokyo) XIV(印刷中)
• 作者: N.Furukawa;C.E.Mair;V.D.Kleiman;J.Takeda
• 通讯作者: J.Takeda