Researchers at the University of Illinois have developed biological robots that are moved by light. Rashid Bashir, head of bioengineering, and other colleagues have created the robots.
Using optogenetics, the researchers can control the tiny robot by light. Skeletal muscle rings shaped like tiny rubber bands are attached to a tiny frame. When the muscle ring is pulsed with light it contracts then returns to it’s normal size, thus moving the robot.
See the video explanation below.