Optical shield: measuring viscosity of turbid fluids using optical tweezers

被引：12
|
作者：
Lee, M. P. [1 ]
Curran, A. [1 ]
Gibson, G. M. [1 ]
Tassieri, M. [2 ]
Heckenberg, N. R. [3 ]
Padgett, M. J. [1 ]
机构：
[1] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland
[2] Univ Glasgow, Sch Engn, Div Biomed Engn, Glasgow G12 8LT, Lanark, Scotland
[3] Univ Queensland, Dept Phys, Brisbane, Qld, Australia
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 11期
基金：
英国工程与自然科学研究理事会;
关键词：
FORCE;
D O I：
10.1364/OE.20.012127
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The viscosity of a fluid can be measured by tracking the motion of a suspended micron-sized particle trapped by optical tweezers. However, when the particle density is high, additional particles entering the trap compromise the tracking procedure and degrade the accuracy of the measurement. In this work we introduce an additional Laguerre-Gaussian, i.e. annular, beam surrounding the trap, acting as an optical shield to exclude contaminating particles. (C) 2012 Optical Society of America
引用
收藏
页码：12127 / 12132
页数：6
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