Propulsion Mechanisms of Light‐Driven Plasmonic Colloidal Micromotors

Colloidal micromotors are important candidates for a wide spectrum of applications, ranging from medicine to environmental remediation. Thus far, the propulsion force determination has been obtained colloidal motor motion speed and surrounding viscosity via Stokes drag. Herein, precise measurement method detailed analysis fundamental mechanisms Janus propelled by thermophoretic steam bubble vectors, revealing findings uninvestigated date, presented. Optical tweezers provide fast high‐precision measurements in all three orthogonal dimensions simultaneously. compared with isotropic hot Brownian reference microparticles, which have no defined vector that propels them perpendicular direction laser beam. display power intensity‐dependent propulsion, as well force‐based after surpassing threshold value water boiling. The thermophorethic vectors sum up micromotor direction. On contrary, counteracts photophoretic propagation light. Moreover, thermal‐based reduction around contributes significantly its guidance abilities.