通过光折变晶体对金属微/纳米粒子进行光镊捕获与操控。

Optical trapping and manipulation of metallic micro/nanoparticles via photorefractive crystals.

作者信息

Zhang Xinzheng, Wang Junqiao, Tang Baiquan, Tan Xinhui, Rupp Romano A, Pan Leiting, Kong Yongfa, Sun Qian, Xu Jingjun

机构信息

MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics School and Institute of Physics, Nankai University, Tianjin, China.

出版信息

Opt Express. 2009 Jun 8;17(12):9981-8. doi: 10.1364/oe.17.009981.

DOI:10.1364/oe.17.009981

PMID:19506648

Abstract

A simple method to trap and manipulate metallic micro/nano-particles on the surface of photorefractive crystals is proposed. After inducing inhomogeneous charge density and space-charge fields in photorefractive crystals by non-uniform illumination, both uncharged and charged metallic particles can be trapped on the illuminated surface due to dielectrophoretic force and electrophoretic force, respectively. A transition from dielectrophoresis to electrophoresis is observed when manipulating nano-silver particles with high surface space-charge field. Our results show that this method is simple and effective to form surface microstructures of metallic particles.

摘要

提出了一种在光折变晶体表面捕获和操纵金属微/纳米粒子的简单方法。通过非均匀光照在光折变晶体中诱导出不均匀的电荷密度和空间电荷场后，不带电和带电的金属粒子分别会由于介电泳力和电泳力而被困在光照表面。在用高表面空间电荷场操纵纳米银粒子时，观察到了从介电泳到电泳的转变。我们的结果表明，该方法对于形成金属粒子的表面微结构简单且有效。