Analysis of molecular elastic response using radiation pressure induced capillary wave

利用辐射压力诱导毛细波分析分子弹性响应

• 批准号: 15206007
• 负责人: SASAKI Keiji
• 金额: $ 26.46万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15206007/
• 关键词: Radiation pressure; Surface tensions; Elastic responses; Capillary wave; Surface elastic wave; Laser manipulation; ナノテクノロジー; レーザー分析

In this research project, we proposed a new method that made it possible to precisely and nondestructively measure surface tensions of air/liquid and liquid/liquid interfaces and elastic responses of polymer-molecule assemblies. In the method, the capillary wave (surface elastic wave) is induced by radiation forces of laser interference fringes. And, with scanning the interference fringes with an electro-optical modulator, the capillary wave can be enhanced under the resonance condition between the surface tension and modulation frequency. Then, the resonated surface wave is detected by diffraction intensity of probing laser. This method is based on our original idea.Unfortunately, the experimental verification of this method has not been achieved in the present research term. This is due to the unknown phenomena related to radiation forces, which makes big problems in improving the accuracy of measurement techniques using radiation forces. One example is complicated distribution of radiation forces caused by the interferences between laser light and its reflection at interfaces. Therefore, we investigated the radiation forces in the vicinity of the interfaces, and we succeeded in precise analysis of complicated force distribution and in elucidating the origin of this phenomenon. This results will brings a breakthrough in the fields of laser manipulation researches.In addition, we also succeeded in analyzing the enhanced energy transfer processes between molecules doped in microspherical cavities. This is one of the demonstrational experiments of the strong coupling fields between photons and molecules. The result indicates that photo-reaction processes can be easily enhanced only by doping the reactants into polymer, glass, and liquid microspheres.

在本研究项目中，我们提出了一种新的方法，可以精确和非破坏性地测量空气/液体和液体/液体界面的表面张力和聚合物分子组装体的弹性响应。该方法利用激光干涉条纹的辐射力产生毛细波（表面弹性波）。并且，用电光调制器扫描干涉条纹，在表面张力和调制频率之间的共振条件下，可以增强毛细波。然后，通过探测激光的衍射强度来检测共振表面波。该方法是基于我们最初的设想，但在目前的研究中，该方法还没有得到实验验证。这是由于与辐射力相关的未知现象，这使得在提高使用辐射力的测量技术的精度方面存在很大问题。一个例子是由激光与其在界面处的反射之间的干涉引起的辐射力的复杂分布。因此，我们研究了界面附近的辐射力，我们成功地精确分析了复杂的力分布，并阐明了这种现象的根源。这一结果将为激光操纵领域的研究带来突破。此外，我们还成功地分析了微球腔中掺杂分子间增强的能量传递过程。这是光子与分子间强耦合场的演示实验之一。结果表明，只有将反应物掺杂到聚合物、玻璃和液体微球中，才能容易地增强光反应过程。

项目成果

H.Fuiiwara: "Observation of the discrete transition of optically trapped particle position in the vicinity of an interface"Applied Physics Letters. 84, 1. 13-15 (2004)

H.Fuiiwara：“界面附近光学捕获粒子位置离散转变的观察”应用物理快报。

Enhancement of F*rster energy transfer within a microspherical cavity

增强微球腔内的 F*rster 能量传递

• 发表时间: 2005
• 期刊: ChenPhysChem 6,11
• 作者: K.Hamamoto;Y.Tanaka;S.Y.Lee;T.Watanabe;H.Kinoshita;H.Fujiwara
• 通讯作者: H.Fujiwara

Fano resonance in a multimode tapered fiber coupled with a microspherical cavity

• DOI: 10.1063/1.1951049
• 发表时间: 2005-06-27
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Chiba, A;Fujiwara, H;Sasaki, K
• 通讯作者: Sasaki, K

微小球におけるエネルギー移動過程の増強効果

微球内能量传递过程的强化效应

• 发表时间: 2005
• 期刊: 光化学 36,2
• 作者: Y.Sawai;H.Nabika;M.Kiguchi;Y.Sawai;B.Takimoto;M.Kiguchi;B.Takimoto;M.Kiguchi;B.Takimoto;H.Nabika;K.Murakoshi;J.Li;Y.Sawai;沢井 良尚;沢井良尚;H.Takashima;H.Fujiwara;H.Takashima;藤原 英樹;H.Konishi;A.Chiba;H.Fujiwara;藤原 英樹
• 通讯作者: 藤原 英樹

Observation of the discrete transition of optically trapped particle position in the vicinity of an interface

• DOI: 10.1063/1.1637947
• 发表时间: 2004-01
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: H. Fujiwara;H. Takasaki;J. Hotta;K. Sasaki