Tiny Robots Powered by Light Can Hunt Down and Collect Bacteria

Topic: Biology

Scientists at Julius-Maximilians-Universität Würzburg have created tiny robots that can collect bacteria using light. These nanorobots are around 50 times smaller than a human hair and can move on their own, making it possible to interact with the microscopic world.

Robots small enough to operate in the microbial world could give scientists a new way to directly handle objects that are impossible to manipulate by hand. These tiny machines are around 50 times smaller than the diameter of a human hair, bringing researchers closer to the long-pursued goal of interacting directly with the microscopic world.

The newly developed nanorobots show that it is already possible to collect bacteria, transport them, and release them at selected locations. Light Powers and Steers the Tiny Robots One of the biggest obstacles in developing machines this small is finding an effective way to propel and control them. At Julius-Maximilians-Universität Würzburg (JMU), a research team led by Professor Bert Hecht has been developing a solution that uses the recoil produced by individual photons to move microscopic devices known as microdrones.

The devices contain as many as four plasmonic nanoantennas. These antennas absorb light with a particular color and helicity, then emit that light in a specific direction. Redirecting each photon creates a tiny recoil force, similar in principle to the recoil produced when a bullet is fired. Because the microdrones have so little mass, those extremely small forces can generate substantial acceleration and speed.

Why It Matters

This technology could be used to clean up contaminated water by removing bacteria and other pollutants. It also has potential applications in biomedical research and medicine.

Key Facts

• Scientists at Julius-Maximilians-Universität Würzburg have created tiny robots that can collect bacteria using light.
• The nanorobots are around 50 times smaller than the diameter of a human hair.
• They can move on their own and interact with the microscopic world.
• The technology uses photon recoil to propel and control the microdrones.
• It has potential applications in cleaning up contaminated water, biomedical research, and medicine.

Key Terms

Photon Recoil

A tiny force created by redirecting individual photons.

Plasmonic Nanoantennas

Tiny antennas that absorb and emit light in a specific direction.

Microdrones

Small devices that can move on their own using photon recoil.

Implications

This technology could be used to clean up contaminated water by removing bacteria and other pollutants. It also has potential applications in biomedical research and medicine.