Chemically synthesized colloidal particles featuring large-scale surface asperities can be trapped and manipulated in fluid media through holographic optical trapping. Light scattering by these particles' surface features provides a mechanism for holographic optical traps also to exert torques on them, thereby setting them in steady rotation about arbitrary axes in three dimensions. When pairs of rotating particles are brought close enough that their surface features mesh, they form microscopic gear trains. These micro-opto-mechanical systems can be arranged in any desired three-dimensional configuration.
|Journal||Applied Physics Letters|
|State||Published - 18 Feb 2013|
Bibliographical noteFunding Information:
We thank Kazem Edmond for his assistance with graphics. We acknowledge use of the NYU Electron Microscopy Facility, which was supported in part by the NSF MRSEC program through Award No. DMR-0923251. This work was supported in part by the National Science Foundation through Award No. DMR-0922680 and in part by a grant from Procter and Gamble.