Researchers at Korea Advanced Institute of Science and Technology created a “moving invisibility cloak” that hides objects from electromagnetic detection even when the surface stretches or shifts shape. The work, published in the journal Small, uses a liquid metal composite ink that absorbs and modulates electromagnetic waves in a flexible form, tells Tech Xplore. Traditional metallic materials are rigid and break when stretched, making them unsuitable for wearable or shape-changing invisibility. The new ink retains conductivity and performance even when extended to 12 times its original length, staying stable in open air for long periods.
The core challenge behind true invisibility is controlling how light and other electromagnetic waves interact with an object’s surface. Conventional approaches often rely on rigid metamaterials that bend or redirect waves around an object, making it appear as though nothing is there. But these methods struggle when the object moves or changes shape. The KAIST team’s liquid metal composite forms a mesh-like structure as it dries, combining flexibility with the ability to interact predictably with electromagnetic fields.
This advance matters because most existing cloaking demonstrations have been either static or limited to particular wavelengths under tightly controlled conditions. Real-world systems such as robots, body-mounted devices, and flexible electronics would need materials that can move, stretch, and maintain performance, and this new approach shows that’s possible. It bridges the gap between “cloaking” as a laboratory concept and practical implementations in dynamic settings.
Potential fields of use include defense-oriented stealth technology, where vehicles or equipment might avoid detection while moving, and consumer electronics that adopt invisible or low-visibility form factors. These applications depend on controlling how objects interact with waves across a range of frequencies, and the ability to stretch without losing electromagnetic control brings the vision closer to reality.