Optical shield: measuring viscosity of turbid fluids using optical tweezers | Zendy

M. P. Lee | Zendy; Arran Curran | Zendy; Graham M. Gibson | Zendy; Manlio Tassieri | Zendy; N. R. Heckenberg | Zendy; Miles J. Padgett | Zendy

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Optical shield: measuring viscosity of turbid fluids using optical tweezers

Author(s) -

M. P. Lee,

Arran Curran,

Graham M. Gibson,

Manlio Tassieri,

N. R. Heckenberg,

Miles J. Padgett

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.012127

Subject(s) - optical tweezers , optics , viscosity , optical force , particle (ecology) , materials science , tracking (education) , light beam , physics , psychology , pedagogy , oceanography , composite material , geology

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.

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