MEASUREMENT OF THE OPTICAL FORCE AND TRAPPING RANGE OF A SINGLE-BEAM GRADIENT OPTICAL TRAP FOR MICRON-SIZED LATEX SPHERES

被引:31
作者
DHELON, C
DEARDEN, EW
RUBINSZTEINDUNLOP, H
HECKENBERG, NR
机构
[1] Department of Physics, The University of Queensland, QLD
关键词
D O I
10.1080/09500349414550581
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A single-beam gradient optical trap was constructed using a 20 mW 632.8 nm He-Ne laser coupled to an optical microscope. Latex spheres were trapped in water at the focal point of a tightly-focused laser beam, which was generated using a 100 x objective. The efficiency of the trap was evaluated by determining the maximum speeds at which the trapped particles could be manipulated. Typical maximum speeds of tens of microns per second were recorded, at the maximum trapping power of 6.7 mW. The effective transverse trapping range for 1-7 mum diameter latex spheres was measured to be 1-3 mum, and the maximum transverse optical force on 1-12 mum diameter latex spheres varied in the range 0.4-4.5 pN.
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页码:595 / 601
页数:7
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