Mini ‘metavehicles’ zip and swerve on light power

Nature
A grey circular path is shown where a metavehicle has travelled

A vehicle roughly 10 micrometres long can trace a circular path under the command of polarized light. Credit: D. Andrén et al./Nature Nanotechnol.

Materials science

Mini ‘metavehicles’ zip and swerve on light power

Light can be used to both propel and steer tiny vehicles made with materials that have distinctive optical properties.

Microscopic vehicles can be powered and steered by light, and even used to transport tiny cargoes, such as single-celled organisms.

Optical metasurfaces are ultrathin materials that can change incoming light’s direction and polarization — that is, the orientation of the light’s electromagnetic waves. Typically, these materials are viewed as being unaffected by the light that they alter. But Daniel Andrén at Chalmers University of Technology in Sweden and his colleagues have shown that this perspective is not always correct.

The authors made minute vehicles consisting of optical metasurfaces embedded in microscopic particles. Laser light propels these ‘metavehicles’ across a surface, and they can be steered by changing the light’s polarization.

To maximize this effect, the team used simulations and experiments to refine the metasurfaces’ structure. They discovered that vehicles incorporating the optimized materials could move in complex patterns, self-correct their orientation and transport tiny objects, including polystyrene beads and yeast cells.

The team says that given the wide range of optical metasurfaces that could be used in these vehicles, they have many potential applications, including in molecular sensing.

Articles You May Like

Quantum Dots Light Up The Brain
China’s pledge to end building coal plants abroad improves Belt and Road’s reputation, development bank says
Biden Brings World Leaders Together At Climate Summit
Viral songs and infectious disease have more in common than you’d think, study finds
U.S. committee is reviewing Zoom’s $14.7 billion deal for Five9 on national-security grounds

Leave a Reply

Your email address will not be published. Required fields are marked *