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Evanescent light scattering with magnetic colloids
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10.1063/1.2035888
/content/aip/journal/apl/87/10/10.1063/1.2035888
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/10/10.1063/1.2035888
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the TIRM setup. The scattered light of the colloidal particle is focused onto a photomultiplier. A magnet creates a magnetic field with adjustable field gradient at the particle position.

Image of FIG. 2.
FIG. 2.

(a) Interaction potential of a superparamagnetic bead and a glass surface, measured at different laser intensities levels of the lower laser tweezers. (b) Resulting light pressure for upper and lower tweezers.

Image of FIG. 3.
FIG. 3.

As Fig. 2 but with the magnetic field varied. At a field of 20 mT (●) the potential is folded back (◇) by increasing the power of the upper tweezer.

Image of FIG. 4.
FIG. 4.

(a) Magnetisation curve of a superparamagnetic particle. The solid line shows a Langevin fit with parameters: , . (b) Same curve but for a particle. The magnetization and the observed forces are about a factor of 10 smaller.

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/content/aip/journal/apl/87/10/10.1063/1.2035888
2005-08-29
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evanescent light scattering with magnetic colloids
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/10/10.1063/1.2035888
10.1063/1.2035888
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