Measurement of the index of refraction of single microparticles
Measurement of the index of refraction of single microparticles
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DOI：
10.1103/physrevlett.97.157402
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发表时间：
2006-10-13
影响因子：
8.6
通讯作者：
Rubinsztein-Dunlop, Halina
中科院分区：
文献类型：
--
作者：
Knoner, Gregor;Parkin, Simon;Rubinsztein-Dunlop, Halina
单个微粒的折射率是通过对激光陷阱的刚度进行精确测量和严格建模而得出的。我们演示了针对直径为 1.6 至 5.2 μm 的四种不同材料颗粒的方法，并取得了优于 1% 的准确度。该方法作为一种新的表征技术做出了巨大贡献，因为它在吸收光谱等其他方法开始失效的条件（小粒径、多分散性）下效果最佳。颗粒不需要转移到特定的流体中，这可以防止索引匹配技术中常见的颗粒降解或改变。我们的结果还表明，激光陷阱的高级建模准确地再现了实验现实。
The refractive index of single microparticles is derived from precise measurement and rigorous modeling of the stiffness of a laser trap. We demonstrate the method for particles of four different materials with diameters from 1.6 to 5.2 mu m and achieve an accuracy of better than 1%. The method greatly contributes as a new characterization technique because it works best under conditions (small particle size, polydispersion) where other methods, such as absorption spectroscopy, start to fail. Particles need not be transferred to a particular fluid, which prevents particle degradation or alteration common in index matching techniques. Our results also show that advanced modeling of laser traps accurately reproduces experimental reality.