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Durham e-Theses
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Optical Trapping and Binding
of Colloidal Microparticles
in Evanescent Waves

WONG, LUEN,YAN (2012) Optical Trapping and Binding
of Colloidal Microparticles
in Evanescent Waves.
Doctoral thesis, Durham University.

PDF - Accepted Version
[img]Video (MPEG) (250nm Au ppol) - Supplemental Material
[img]Video (MPEG) (250nm Au spol) - Supplemental Material
[img]Video (MPEG) (460nm PS compression) - Supplemental Material
[img]Video (MPEG) (520nm PS shooting off) - Supplemental Material
[img]Video (MPEG) (800nm PS incoherent open cluster) - Supplemental Material
[img]Video (MPEG) (800nm PS popcorn) - Supplemental Material


Optical trapping of colloidal microparticle arrays in evanescent fields is a relatively new area of study. Optically driven array formation is a complex and fascinating area of study, since light mediated interactions have been shown to cause significantly different behaviour for multiple particles when compared with the behaviour of a single particle in an optical field.

Array formation was studied with interference fringes in the counterpropagating evanescent fields so as to investigate the effect of a periodic trapping potential. A subtle balance between optical trapping and optical binding forces is shown to produce modulated lines and arrays. Optically trapped colloidal arrays were also studied in the absence of interference fringes, by using either orthogonally polarised laser beams or a beam delay line. When interference fringes were absent, the formation of arrays was mainly due to gradient forces and optical binding. The experimental studies presented here include the optical trapping of dielectric soft and hard spheres, Au colloids, and Janus particles.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Keywords:Optical trapping, optical binding, evanescent fields
Faculty and Department:Faculty of Science > Chemistry, Department of
Thesis Date:2012
Copyright:Copyright of this thesis is held by the author
Deposited On:24 Feb 2012 10:23

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