Optically bound particle structures in evanescent wave traps

Optically bound particle structures in evanescent wave traps
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倏逝波陷阱中的光学束缚粒子结构

DOI:
10.1117/12.929612
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发表时间:
2012
期刊:
--
影响因子:
--
通讯作者:
Sergides M
Sergides M
中科院分区:
--
文献类型:
--
作者:
Sergides M

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我们提出了一个研究的操纵微粒和形成的光学约束结构的粒子在倏逝波陷阱。被认为是两个捕获的几何形状:第一个是一个表面陷阱,在玻璃棱镜上方的倏逝场是由棱镜-水界面上入射的激光束的数量的干涉形成的;第二个使用倏逝场周围的双锥锥形光纤已被拉伸,以产生一个腰部的亚微米直径。在表面陷阱中,我们观察到一维链结构的微粒的光学结合。在锥形光纤陷阱中,我们演示了粒子沿光纤沿着长距离传输,并形成稳定的粒子阵列。在这两个实验中,我们使用视频显微镜来跟踪粒子的位置,并进行定量测量的粒子动力学。粒子结构的实验研究补充了基于米氏理论的光散射计算,以推断所观察到的粒子结构的几何形状是如何由底层的入射和散射光场控制的。
We present a study of the manipulation of microparticles and the formation of optically bound structures of particles in evanescent wave traps. Two trapping geometries are considered: the first is a surface trap where the evanescent field above a glass prism is formed by the interference of a number of laser beams incident on the prism-water interface; the second uses the evanescent field surrounding a biconical tapered optical fiber that has been stretched to produce a waist of submicron diameter. In the surface trap we observe optical binding of microparticles in to one-dimensional chain structures. In the tapered optical fiber trap we demonstrate both particle transport for long distances along the fiber, and the formation of stable arrays of particles. In both experiments we use video microscopy to track the particle locations and make quantitative measures of the particle dynamics. The experimental studies of particle structures are complemented by light scattering calculations based on Mie theory to infer how the geometries of the observed particle structures are controlled by the underlying incident and scattered optical fields.
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