What this work contributes
Demonstrates optically driven microscopic vehicles whose metasurfaces redirect light. Polarization changes steer their trajectories, and the devices move microscopic cargo. This is a tangible example of geometry controlling motion through a specified external momentum source.
Where the evidence stops
The vehicles depend on incident light and their laboratory surroundings. The experiment does not demonstrate spacecraft performance or isolated thrust from internal optical components.
Keep the conditions with the result
- Measured / modeled quantity
- Particle trajectories, optical steering and cargo transport
- Reported scale
- Microscopic vehicles; quantitative force or speed not extracted.
- Conditions
- Laboratory particles under externally supplied plane-wave illumination.
- Evidence context
- Motion, steering and transport demonstrations reported by the authors; independent replication not assessed.
- Design use
- Explain momentum redirection visually and separate demonstrated transport from spacecraft extrapolation.
- Review access
- Publisher and Chalmers abstracts and bibliographic metadata checked; full text not reviewed.
Original source
Daniel Andrén, Denis G. Baranov, Steven Jones, Giovanni Volpe, Ruggero Verre, Mikael Käll. Microscopic metavehicles powered and steered by embedded optical metasurfaces. Nature Nanotechnology 16, 970–974 (2021).
DOI: 10.1038/s41565-021-00941-0
How we use it
This record belongs to Photon momentum. Its evidence label describes the cited work, not the maturity of a Metric Flight device. Follow the original methods, corrections and conditions before transferring a result to a different geometry or scale.
Editorial note reviewed 19 October 2026. AI assisted research discovery and synthesis. Citation metadata and claims were checked against primary publication or institutional records; full-text access varies. Read the source for the complete method.