Researchers have developed the first 3D, omnidirectional thermal “cloak” capable of making objects invisible to infrared cameras from any direction.
Compared with previous designs that only worked in two dimensions or at a single angle, this new device guides heat around an object rather than just blocking it, making it “appear as if nothing is there.”
The innovative work, published in the journal, Nature Communications, was an international effort developed in partnership with the Technical University of Denmark (DTU). “A real thermal cloak should work no matter where the heat comes from.
Our device can hide a complex 3D object in an infinite number of directions while keeping the temperature inside stable and protected,” said Shelly Zhang, Civil and Environmental Engineering professor at the University of Illinois Urbana-Champaign.
Typically, objects like soldiers, drones, or overheating microchips emit a distinct thermal signature that makes them easily detectable in the dark. However, this innovative material completely erases thermal signatures from infrared screens by altering how heat is emitted and detected.
To solve a problem that has stumped materials scientists for years, the team went back to the foundational math of heat transfer. Standard, off-the-shelf materials were insufficient, demanding an entirely new structure for the cloak.
The result is a complex 3D-printed lattice framework that resembles a high-tech honeycomb. Physically fabricated and successfully tested, this hybrid device features a 3D-printed aluminum lattice for high thermal conductivity, filled via mold casting with a low conductivity, rubber-like material.
Three-dimensional adjustments of the lattice dimensions enabled precise tuning of localised thermal conductivity. When warmth hits the cloak, it doesn’t push through to the object inside.
It glides around the outer shell like water parting around a smooth stone in a river, smoothly stitching back together on the other side.
To an infrared camera looking at the setup, the thermal landscape appears entirely undisturbed. The object disappears from sight.
Older technologies failed if the environment shifted or the viewing angle changed, but this innovation maintains its illusion across complex surfaces and dynamic environments.
In the testing, the material was put into extreme temperature gradients, and an infrared camera was used to track heat flow.
To an outside observer, the temperature field appeared completely normal as if the hidden object wasn’t there at all. While the interior of the cloaked region remained at a safe, uniform temperature, protected from external extremes.
To push the envelope, the researchers even successfully cloaked highly irregular geometries, including a detailed 3D model of a human head.
