Mano Raj Dhanalakshmi Veeraraj, a PhD student in Switzerland, recently captured something remarkable: a clear, magnified image of a tiny PSI logo — just 3 millimeters wide — even though the logo sat 6 meters, or about 20 feet, away from the camera. No special tricks were involved. The secret was a brand-new kind of lens that his team built from scratch.\n\nResearchers at the Paul Scherrer Institute (PSI) in Villigen, Switzerland have created the world's first lens designed specifically for focusing neutron beams. Neutrons are tiny particles that can slip deep inside heavy metals and reveal things X-rays often miss — like where lithium or hydrogen is hiding inside a battery or engine part. But that same gentle touch that lets neutrons pass through solid metal also makes them incredibly hard to bend or focus. For decades, scientists could only image neutron beams without any lens at all, which meant placing objects right next to the detector to keep the picture sharp.\n\nThat limitation is now over. The new PSI lens, called an achromatic neutron lens, can bend neutrons of different colors — different wavelengths, in scientific terms — all to the same focal point at once. The result: sharp, magnified images with a resolution finer than 20 micrometers, which is thinner than a human hair split in half. The team tested it by imaging a regular lithium-ion battery positioned 6 meters from the detector and magnified the internal layered structure seven times.\n\nJoan Vila-Comamala, the PSI scientist who led the research team, put it plainly: "The lack of such a lens has held back neutron imaging for decades. Now that we have it, it becomes possible to follow processes inside equipment such as furnaces, cryostats or pressure cells." Scientists could soon watch how lithium moves inside a battery while it's actually running, or peek inside an engine without taking it apart.\n\nVeeraraj sees this as just the start. The technology builds on the team's earlier work creating an achromatic lens for X-rays in 2022. To make the most of the new neutron lens, some research facilities may need longer beamlines — longer tunnels for the neutron beam to travel through. The European Spallation Source, a major new neutron facility currently under construction in Sweden, is already being designed with those longer distances in mind, opening the door to even more powerful imaging in the years ahead.