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Effects of optical forces on the transmission of magnetic fluids investigated by -scan technique
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10.1063/1.3203938
/content/aip/journal/jap/106/4/10.1063/1.3203938
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/4/10.1063/1.3203938

Figures

Image of FIG. 1.
FIG. 1.

(a) Dependence of the module of the effective dielectric constant on the real and imaginary parts of the dielectric constant ( and ). (b) Dependence of the imaginary part of the effective dielectric constant on the real and imaginary parts of the dielectric constant ( and ). The points corresponding to magnetic, gold and silica particles are marked on the figures.

Image of FIG. 2.
FIG. 2.

Dependence of and on the radius of particles.

Image of FIG. 3.
FIG. 3.

Influence of incident power density on the transmission of magnetic fluids observed in the switching operations under (a) low and (b) high power densities.

Image of FIG. 4.
FIG. 4.

-scan traces for sample obtained at different incident powers. The radius of the laser beam at the focus point is estimated to be . (a) Three consecutive -scan traces obtained at low incident powers of 3, 5, and 10 mW. (b) Three consecutive -scan traces obtained at high incident powers of 20, 30, 40, 50, and 100 mW.

Image of FIG. 5.
FIG. 5.

Comparison of the -scan traces for sample obtained at (a) low and (b) high incident powers.

Image of FIG. 6.
FIG. 6.

-scan traces for sample obtained at different incident powers. The radius of the laser beam at the focus point is estimated to be . (a) Three consecutive -scan traces obtained at low incident powers of 3, 5, and 10 mW. (b) Three consecutive -scan traces obtained at high incident powers of 20, 30, 40, 50, and 100 mW.

Image of FIG. 7.
FIG. 7.

-scan traces for sample obtained at different incident powers. The radius of the laser beam at the focus point is estimated to be . (a) Three consecutive -scan traces obtained at low incident powers of 3, 5, 10, and 20 mW. (b) Three consecutive -scan traces obtained at high incident powers of 30, 40, 50, and 100 mW.

Image of FIG. 8.
FIG. 8.

Morphology changes of different magnetic fluids induced by increasing incident power. The radius of the laser beam is estimated to be . (a) Sample at 25 mW; (b) sample at 50 mW; (c) sample at 30 mW; (d) sample at 50 mW; (e) sample at 100 mW; and (f) sample at 300 mW.

Image of FIG. 9.
FIG. 9.

Schematic showing the dynamical migration and clustering of magnetic particles induced by optical forces in the -scan processes under (a) low and (b) high incident powers.

Image of FIG. 10.
FIG. 10.

Dependence of the recovery time on incident power density observed in the -scan processes for sample .

Tables

Generic image for table
Table I.

Comparison of various optical forces exerted on magnetic, gold and silica particles. The optical forces have been normalized with respect to . The parameters used in the calculation are , , , , and .

Generic image for table
Table II.

Comparison of various optical forces exerted on the same particles.

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/content/aip/journal/jap/106/4/10.1063/1.3203938
2009-08-21
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of optical forces on the transmission of magnetic fluids investigated by Z-scan technique
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/4/10.1063/1.3203938
10.1063/1.3203938
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