光学镊子
俘获
瑞利散射
极化率
材料科学
压力梯度力
散射
球体
光学
光学力
电介质
金属
低语长廊波浪
米氏散射
光散射
折射率
激光器
波长
分子物理学
粒子(生态学)
物理
光电子学
生物
量子力学
冶金
分子
生态学
天文
作者
Karel Svoboda,Steven M. Block
出处
期刊:Optics Letters
[The Optical Society]
日期:1994-07-01
卷期号:19 (13): 930-930
被引量:691
摘要
Metallic objects reflect light and have generally been considered poor candidates for optical traps, particularly with optical tweezers, which rely on a gradient force to provide trapping. We demonstrate that stable trapping can occur with optical tweezers when they are used with small metallic Rayleigh particles. In this size regime, the scattering pictures for metals and dielectrics are similar, and the larger polarizability of metals implies that trapping forces are greater. The latter fact makes the use of metal particles attractive for certain biological applications. Comparison of trapping forces for latex and gold spheres demonstrates that the gradient force is the major determinant of trapping strength and that competing effects, such as scattering or radiometric forces, are relatively minor.
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