Researchers have built a three-dimensional invisibility cloak that can hide complex objects from infrared cameras while also protecting them from extreme heat and cold. Rather than blocking heat, the device guides it around the object, so the object does not show up to thermal imaging from virtually any direction. The team has successfully built and tested the cloak, and the work points to possible uses in electronics cooling, thermal protection and stealth technology.
The approach differs from earlier thermal cloaking ideas in its geometry. Because the cloak works in three dimensions, it does not depend on viewing the object from a single fixed angle. Instead, it steers heat flow around the hidden object so that the surface temperature pattern a thermal camera would record looks uniform, as if nothing were there. The device is designed to protect the object from both extreme heat and extreme cold while maintaining this effect, which is what distinguishes it from a simple heat shield.
The potential applications extend beyond concealment. In electronics, managing heat is a constant challenge, and a structure that redirects thermal energy around sensitive components could help keep them within safe operating temperatures. The same principle could be applied to thermal protection, where shielding equipment from temperature extremes is essential in demanding environments. The demonstration suggests that the underlying idea, directing heat rather than simply insulating against it, can be realized in a physical device rather than remaining a theoretical concept.
The work also sits within a wider effort to control how heat moves through materials, a problem that has proved difficult in practice. A related study by researchers at North Carolina State University, led by mechanical and aerospace engineer Jun Liu together with physicist Dali Sun, reported a layered hybrid organic–inorganic perovskite with a thermal conductivity of just 0.04 W/m/K at room temperature. Its elastic modulus reaches 7.7 GPa, higher than that of most plastics, foams and aerogels, according to Liu. The study, published in Science Advances, is not the same project, but it shows how molecular design can be used to push thermal insulation to new extremes.
For context, most crystalline and ceramic solids conduct heat far more readily, with thermal conductivities typically between 1000 and 2000 W/m/K at room temperature, while plastics fall between 0.1 and 0.5 W/m/K. Only a few dense solids have conductivities below 0.1 W/m/K. Heat transport in solids depends largely on phonons, the quantized vibrations of a crystal lattice, and reducing it has traditionally involved shortening the distance phonons travel between scattering events or slowing their group velocity. Liu described the central challenge of the perovskite work as determining whether molecular design could produce very low thermal conductivity in a dense, mechanically rigid material, rather than relying on pores or other structural softness as earlier studies had done.
Liu's team plans to test its thin film as a coating for practical applications and is working to replace the lead in its composition with non-toxic metals. Taken together, the two lines of research suggest that heat can be guided, blocked or insulated with increasing precision, though the cloak itself remains a laboratory demonstration whose performance in real-world conditions has not been described in the reporting available here.