  Nanostructured dielectric metasurfaces offer unprecedented opportunities to
manipulate light by imprinting an arbitrary phase-gradient on an impinging
wavefront. This has resulted in the realization of a range of flat analogs to
classical optical components like lenses, waveplates and axicons. However, the
change in linear and angular optical momentum associated with phase
manipulation also results in previously unexploited forces acting on the
metasurface itself. Here, we show that these optomechanical effects can be
utilized to construct optical metavehicles - microscopic particles that can
travel long distances under low-power plane-wave illumination while being
steered through the polarization of the incident light. We demonstrate movement
in complex patterns, self-correcting motion, and an application as transport
vehicles for microscopic cargo, including unicellular organisms. The abundance
of possible optical metasurfaces attests to the prospect of developing a wide
variety of metavehicles with specialized functional behavior.
