Cornell Team Creates Microscopic Robot that Improves Imaging

Cornell University researchers have developed the world's smallest walking robot, pushing the boundaries of miniaturization in robotics. This breakthrough, detailed in Science, opens new possibilities for imaging and measurement at microscopic scales.

The new robots, ranging from 2 to 5 microns in size, are designed to interact with visible light waves while maintaining independent mobility. This unique combination allows them to navigate to specific locations within samples, such as tissue, to capture images and measure forces at scales previously unattainable.

Paul McEuen, the team leader, explains the significance: "A walking robot that's small enough to interact with and shape light effectively takes a microscope's lens and puts it directly into the microworld. It can perform up-close imaging in ways that a regular microscope never could."

These "diffractive robots" represent a substantial leap from Cornell's previous record-holding smallest walking robot, which measured 40-70 microns. Itai Cohen, a co-author of the study, emphasizes their versatility: "These robots are tiny. And we can get them to do whatever we want by controlling the magnetic fields driving their motions."

The robots' movement is controlled by magnets making a pinching motion, allowing them to inch-worm forward on solid surfaces or "swim" through fluids. This maneuverability, combined with their sub-diffractive optical technology, marks a significant advance in robotics.

By bridging the gap between untethered robots and visible light diffraction imaging techniques, this innovation paves the way for new applications in microscopic imaging and measurement.