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In this article we explore the dynamics of a Brownian particle in afeedback-free dynamic thermophoretic trap. The trap contains a focused laserbeam heating a circular gold structure locally and creating a repulsive thermalpotential for a Brownian particle. In order to confine a particle the heatingbeam is steered along the circumference of the gold structure leading to anon-trivial motion of the particle. We theoretically find a stability conditionby switching to a rotating frame, where the laser beam is at rest. Particletrajectories and stable points are calculated as a function of the laserrotations frequency and are experimentally confirmed. Additionally, the effectof Brownian motion is considered. The present study complements the dynamicthermophoretic trapping with a theoretical basis and will enhance theapplicability in micro- and nanofluidic devices.

Trapping of Single Nano-Objects in Dynamic Temperature Fields