Stanford scientists have built a fingernail-sized chip that turns jumbled light into clean beams

NewsScience NewsStanford scientists have built a fingernail-sized chip that takes jumbled light from multiple sources and separates it into clean beams; the device could one day improve microscopes, telescopes and cameras Stanford scientists have built a fingernail-sized chip that takes jumbled light from multiple sources and separates it into clean beams; the device could one day improve microscopes, telescopes and cameras TOI Science Desk / TIMESOFINDIA.COM / Nov 09, 2026, 04:50 IST Image Courtesy: Institute of Science and Technology of Austria Light is something we rarely think twice about.

It enters our homes through windows, illuminates the streets at night and helps us capture everything from a beautiful sunset to the tiniest details under a microscope. But what if the light reaching our eyes isn't as simple as it appears?

What if it is several sources sending out light waves that overlap, interfere with one another and arrive at slightly different times?Most cameras record this mixture as a single image. In the process, however, they can lose information that is hidden within the light itself.Researchers at Stanford University, along with collaborators in Austria and Italy, have now found a way to tackle this problem.

They have developed a tiny chip, roughly the size of a fingernail, that can take mixed light and separate it into individual, clean beams. The technology addresses a problem scientists have been thinking about since the 1980s, but which had not been demonstrated in this physical form before.Why is mixed light so difficult to work with?

Not all light behaves in the same way. Consider a laser pointer and a light bulb. Although both produce light, the way their light waves behave is quite different. A laser produces what scientists call coherent light. Its light waves move in a coordinated manner, almost like a group of swimmers following the same rhythm.

When these waves meet, they can reinforce one another or cancel each other out, creating distinct patterns. A regular light bulb, on the other hand, produces light whose waves are largely out of sync. They do not follow the same rhythm, which is why the resulting light appears more scattered and diffuse.Most light we encounter in the real world falls somewhere between these two extremes.

Scientists describe it as partially coherent, meaning that some of its waves may be organised while others are not. This creates a bit of a problem. When light from different sources overlaps, it becomes difficult to distinguish one contribution from another.

The resulting interference can also make optical instruments less effective.But the Stanford researchers believe this seemingly messy behaviour could actually be useful. Instead of treating partially coherent light as something to get rid of, they wanted to understand whether its individual components could be separated and studied.How does the tiny chip work?

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