Volume 116, Number 6, December 2016
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||06 February 2017|
2-D evanescent trapping of colloids in the vicinity of a micrometer waveguide
1 Université Rennes 1 - 35042 Rennes cedex, France
2 UMR CNRS 6251 IPR, Université Rennes 1 - 35042 Rennes cedex, France
Received: 1 September 2016
Accepted: 17 January 2017
We report on the trapping of micrometer colloids using the evanescent wave from a multimode cylindrical optical waveguide. We show that the particle trapping is a two-step process. With a low-power visible laser injected in the device, particles are first captured at a radial distance twice greater than the diameter of the waveguide and then drawn near to it. In a second time particles turn around the waveguide and get trapped in a direction corresponding to the TM polarization of the laser. Such a device could be easily implemented in microfluidic systems in order to coat surfaces or to control particles deposition and assembly. Conversely, it could find applications in the filtration process to aggregate and remove colloidal pollutants.
PACS: 47.57.J- – Colloidal systems / 42.50.Wk – Mechanical effects of light on material media, microstructures and particles / 64.75.Xc – Phase separation and segregation in colloidal systems
© EPLA, 2016
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