Scientists have developed a theoretical material designed to regulate how heat is released in programmable ways, potentially revolutionizing energy efficiency and enabling heat-based information storage. The breakthrough, published in June in Laser & Photonics Reviews, challenges a fundamental principle established nearly 160 years ago by physicist Gustav Kirchhoff, which dictated that materials absorbing heat from one direction must equally emit it in that same direction.
The innovative device combines two materials with opposing properties. Researchers used a magnetic field to break the natural symmetry in indium arsenide, a substance that interacts with infrared light, causing radiation to behave differently depending on its direction of travel. Above this layer sits germanium-antimony-tellurium, a phase-changing material that can switch between distinct physical states and maintain that configuration indefinitely without continuous power, effectively “programming” the heat-directing behavior.
The design demonstrates remarkable practical advantages over previous attempts at directional control, functioning effectively when radiation arrives at angles as shallow as three degrees from a straight line, making integration into real-world systems feasible. Experts compare the device to computer memory, as it preserves its programmed state after power disconnection, though it stores a material structure rather than heat itself.
Currently theoretical, the device has not yet been constructed or tested. However, researchers believe it is realistic given its reliance on well-established materials and manufacturing techniques. Once developed, the technology could first find application in infrared sensing applications.
Originally reported by Livescience →
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