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Optical force field mapping in microdevices

delete2006-01-01
delete12
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OA
AI
G
Gregor Knöner
A
Adrian Ratnapala
T
Timo A. Nieminen
C
Chris Vale
N
N. R. Heckenberg
H
Halina Rubinsztein‐Dunlop *
DOI:10.1039/b608669adelete
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摘要

摘要

En 中文
We present a method for characterizing microscopic optical force fields. Two dimensional vector force maps are generated by measuring the optical force applied to a probe particle for a grid of particle positions. The method is used to map Out the force field created by the beam from a lensed fiber inside a liquid filled microdevice. We find transverse gradient forces and axial scattering forces on the order of 2 pN per 10 mW laser power which are constant over a considerable axial range (> 35 mu m). These findings suggest Future useful applications of lensed fibers for particle guiding/sorting. The propulsion of a small particle at a constant velocity of 200 mu m s(-1) is shown.
Keyword:
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期刊

L
Lab on a Chip
IF:
5.4
论文数:
9.0K
被引数:
3.3W

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