Issue 127, 2015

Plasmonic absorption activated trapping and assembling of colloidal crystals with non-resonant continuous gold films

Abstract

Here we report the realization of trapping and assembly of colloidal crystals on continuous gold thin films based on the combined effect of thermophoresis and thermal convection associated with plasmonic optical heating. In the system, the stabilized trapping phenomenon is driven by thermophoretic forces caused by a temperature gradient which pushes the target particles from cold to hot regions and always in an opposite direction to the axial convective drag forces. Furthermore, the lateral convective flow of an aqueous medium accelerates the formation of the trap considerably by dragging target particles into the hot region from a long distance. The influence of salt concentration on the trapping behavior has also been investigated. Typically the threshold optical power density is in the order of microwatts per square micrometer (∼μW μm−2). We anticipate that the reported optical trapping approach may find many potential applications in biophysics, life sciences, and lab-on-a-chip devices.

Graphical abstract: Plasmonic absorption activated trapping and assembling of colloidal crystals with non-resonant continuous gold films

Article information

Article type
Paper
Submitted
20 Sep 2015
Accepted
08 Dec 2015
First published
09 Dec 2015

RSC Adv., 2015,5, 105409-105415

Author version available

Plasmonic absorption activated trapping and assembling of colloidal crystals with non-resonant continuous gold films

Z. Kang, J. Chen, S. Wu and H. Ho, RSC Adv., 2015, 5, 105409 DOI: 10.1039/C5RA19398B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements