Development of Dynamic Light Scattering Method using Radiation Pressure-Induced Motion of Particles in Suspension

利用辐射压力引起悬浮颗粒运动的动态光散射方法的发展

• 批准号: 06555009
• 负责人: ASAKURA Toshimitsu
• 金额: $ 0.83万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555009/
• 关键词: Radiation pressure of light; Dynamic light scattering; Brownian motion; Photophoresis; Fokker-Planck equation; Multiple scattering; Enhanced backscattering; DIffusive transport theory; 微粒子計測; Radiation pressure of light; Dynamic light scattering; Brownian motion; Photophoresis; Fokker-Planck equation; Multiple scattering; Enhanced backscattering; DIffusive transport theory; 微粒子計測

The dynamics of particles in suspension under the laser radiation pressure and the spatiotemporal properties of the light scattered from these particles have been analyzed theoretically and experimentally for investigating an applicability of the laser radiation pressure as a tool to accurately extract information of the static and dynamic structures of particles in suspension. The statistical properties of coherent light multiply scattered backward by the highly concentrated system of particles have also been investigated theoretically and experimentally. The main results are summarized in the following :1. Suppression of the Brownian motion of particles : Suppression of the Brownian motion of particles in suspension due to a gradient force component of the radiation pressure is found to have the particle-size dependence. This dependence on the particles size is also found as an increase of the correlation time of corresponding temporal fluctuations of the scattered light. A new conce … More pt of the dynamic light scattering method using the radiation pressure of laser light has been proposed for sizing the particles accurately.2. Translational motion of particles : Size-dependence of the velocity of the translational motion of particles in the beam-propagation direction due to the scattering force component of the radiation pressure has been revealed. It is also found that the spatial distribution of the velocity is strongly dependent on the particle size, especially for particles in the Mie scattering regime. A new technique for the particle sizing was proposed which utilizes the radiation-pressure induced motion of particles in suspension.3. Spatiotemporal properties of enhanced backscattering of light : It has been found theoretically and experimentally that the size of particles in suspension and the polarization derection of scattered light strongly influence the shape and peak value of the enhanced backscattering peak and the temporal behavior of the backscattered light. It has been revealed that these effects can be described by the optical-path distribution of the scattered light in the medium. Less

已经对从这些颗粒散射的光的光线和散射的光的空间临时性质进行了悬浮液中的颗粒动力学，并在实验上进行了研究，以研究激光辐射压力的适用性，作为一种工具，可以准确提取悬浮液中颗粒的静态和动态结构的信息。还研究了理论上和实验研究了相干光的统计特性乘以高度浓缩的颗粒系统。主要结果总结在以下：1。抑制颗粒的布朗运动：由于辐射压力的梯度成分的悬浮液在悬浮液中的抑制，发现颗粒大小的依赖性。这种对颗粒大小的依赖性也被发现是散射光的相应临时波动的对应时间的增加。一种新的conce…使用激光光的辐射压力进行了更多的动态光散射方法，以准确尺寸尺寸。2。颗粒的翻译运动：由于辐射压力的散射力成分，粒子在光束散发方向上翻译运动速度的尺寸依赖性已显示出来。还发现，速度的空间分布在很大程度上取决于粒径，尤其是MIE散射状态中的颗粒。提出了一种针对粒度尺寸的新技术，该技术利用了悬浮液中的辐射压力诱导的颗粒运动。3。增强的光的后散射的时空特性：从理论和实验中发现，悬浮液中颗粒的大小以及散射光的极化扣除强烈影响增强的后散射峰的形状和峰值和临时行为的形状和峰值。已经揭示了这些效应可以通过介质中散射光的光学路径分布来描述。较少的