SMRTR Science & EngineeringSep 18, 2025Interesting Engineering

Scientists create light-powered smallest motors that fit inside a strand of hair

SMRTR summary

Scientists at the University of Gothenburg have created the smallest on-chip motor in history, fitting inside a human hair. This breakthrough uses laser light to power silicon gears with optical metamaterial, controlling speed and rotation direction. These tiny motors (16-20 micrometers) could revolutionize medicine as internal pumps or valves, manipulate particles, control light, or enhance lab-on-a-chip systems. However, practical applications may take years to develop.

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