Akshay Rao

Light is not just a beam but a wave with an electric field that changes at a speed unimaginable to ordinary clocks. Until now, this field could only be measured at a single point, like taking temperature with a single thermometer. Now researchers have created a method that shows the entire field at once, like a thermal imager showing a heat map.

Sunlight hits a crystal, and inside, a pair is born — a swift electron and a hole. Ideally, they immediately race off to the contacts and produce current. But in the material the authors studied, things go differently. The moment a charge stumbles upon a void, a missing atom in the lattice, a cloud of vibrations tightens around it.