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Focusing surface plasmon polariton trapping of colloidal particles
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Image of FIG. 1.

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FIG. 1.

(a) SEM image of the SPP launching nanostructure and in-plane FZP. (b) Near-field optical image of SPP waves focusing. (c) Schematic of the experimental.

Image of FIG. 2.

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FIG. 2.

(a) Colloidal particle migration toward the illumination center in a large scale and self-organization into an extended hexagonal array (inset). (b) Plot of the mean particle velocity as a function of incident angle and recorded reflectivity.

Image of FIG. 3.

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FIG. 3.

Colloidal particles are trapped by a square pattern of silver pads in the SPP launching nanostructure.

Image of FIG. 4.

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FIG. 4.

A sequence of successive images recorded at the in-plane FZP focus area restituting the dynamical behavior of diameter colloidal particles. The red arrows show the direction of the SPP propagation.

Image of FIG. 5.

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FIG. 5.

(a) Electrical field of the SPP propagation and focusing simulated by FDTD. (b) Plot of the SPP intensity at the focal plane.

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/content/aip/journal/apl/94/6/10.1063/1.3072610
2009-02-13
2014-04-25

Abstract

We report focusing surface plasmonpolariton (SPP) trapping of colloidal particles without optical interactions. Using a silvernanostructure, we demonstrate SPP launching and propagation under a -polarized incident laser. In-plane Fresnel zone plate (FZP) is used to focus the SPP waves. Colloidal particles can be trapped at the silvernanostructure in the illumination region and the FZP focus area by focusing SPP force. The SPP tweezers open new perspectives in the subwavelength trapping and applications to lab-on-chip devices.

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Scitation: Focusing surface plasmon polariton trapping of colloidal particles
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/6/10.1063/1.3072610
10.1063/1.3072610
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