Light can tell you a lot about what matter is doing. Visible light shows a surface. X-rays reveal hidden structure. Infrared ...

Ciaran O'Hare scribbles symbols using colored markers across his whiteboard like he's trying to solve a crime—or perhaps ...

MIT researchers have built a terahertz microscope that reveals hidden quantum motion inside superconductors for the first time.

You can tell a lot about a material based on the type of light shining at it: Optical light illuminates a material's surface, ...