Jump to main content
Jump to site search

Issue 29, 2014
Previous Article Next Article

Trapping of single nano-objects in dynamic temperature fields

Author affiliations


In this article we explore the dynamics of a Brownian particle in a feedback-free dynamic thermophoretic trap. The trap contains a focused laser beam heating a circular gold structure locally and creating a repulsive thermal potential for a Brownian particle. In order to confine a particle the heating beam is steered along the circumference of the gold structure leading to a non-trivial motion of the particle. We theoretically find a stability condition by switching to a rotating frame, where the laser beam is at rest. Particle trajectories and stable points are calculated as a function of the laser rotation frequency and are experimentally confirmed. Additionally, the effect of Brownian motion is considered. The present study complements the dynamic thermophoretic trapping with a theoretical basis and will enhance the applicability in micro- and nanofluidic devices.

Graphical abstract: Trapping of single nano-objects in dynamic temperature fields

Back to tab navigation

Additions and corrections

Publication details

The article was received on 10 Apr 2014, accepted on 09 Jun 2014 and first published on 09 Jun 2014

Article type: Paper
DOI: 10.1039/C4CP01560F
Author version
Download author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2014,16, 15207-15213

  •   Request permissions

    Trapping of single nano-objects in dynamic temperature fields

    M. Braun, A. Würger and F. Cichos, Phys. Chem. Chem. Phys., 2014, 16, 15207
    DOI: 10.1039/C4CP01560F

Search articles by author