Felgner H, Müller O, Schliwa M
Appl Opt. 1995 Feb 20;34(6):977-82. doi: 10.1364/AO.34.000977.
Axial and lateral optical-trapping forces on polystyrene and glass microbeads are measured as a function of sphere size and axial trapping position inside a specimen chamber containing water. A strong decrease of the light forces with increasing distance of the trapping position from the coverslip of the chamber is found. It is shown that beyond a certain maximal distance the trapping efficiency decreases substantially but trapping becomes possible in different, axial positions. We consider these effects to be accounted for by spherical aberration of the focused laser beam.
在装有水的样品室内，测量了聚苯乙烯和玻璃微珠上的轴向和横向光阱力与球体尺寸及轴向捕获位置的函数关系。发现随着捕获位置与样品室盖玻片距离的增加，光力急剧下降。结果表明，超过一定的最大距离后，捕获效率大幅降低，但在不同的轴向位置仍可实现捕获。我们认为这些效应是由聚焦激光束的球差引起的。
