This Metamaterial Reads Molecules Like Fingerprints — and Cleans Itself After Every Use
In 1974, a group of scientists at Imperial College discovered that when you shine light on a rough silver surface, the molecules sitting on top of it scatter far more light than they should, about a million times more. That accidental finding, surface-enhanced Raman spectroscopy (SERS), gave chemists a superpower: the ability to identify individual molecules by the way they vibrate. A few years later, researchers found that infrared light, the kind your TV remote uses, could be similarly amplified on nanostructured surfaces. The catch? Nobody could get both techniques to work on the same device.