Image Courtesy: Metropolitan University
Scientists have developed a programmable material that can control how heat is absorbed and emitted, overcoming a long-standing limitation in physics and opening the door to more efficient energy systems, advanced infrared sensors, and next-generation data storage technologies.
The breakthrough was achieved by an international team led by Professor Koichi Okamoto and Dr. Shunsuke Murai at Osaka Metropolitan University’s Graduate School of Engineering. Their new device uses a combination of magneto-optical and phase change materials to direct thermal radiation in programmable ways, while retaining its configuration even after power is switched off.
Under normal conditions, materials obey a principle known as reciprocity, meaning they absorb and emit heat in the same way. This makes it impossible to independently control how thermal energy enters and leaves a surface. By breaking that link, the researchers created a system capable of steering heat with far greater precision than previously possible.
The team combined a magneto-optical material, which changes its optical behavior in response to magnetic fields, with the phase change material GST. The resulting device can switch the direction of thermal radiation on or off and remember its programmed state without requiring a continuous power supply, much like non-volatile computer memory.
Testing also demonstrated a significant improvement over previous designs. Earlier systems only functioned effectively when light struck them at extremely steep angles, limiting their efficiency. The new device maintained directional control even when light arrived almost head-on, making it more practical for real-world applications.
The researchers also addressed another major challenge. Previous programmable thermal devices often switched unreliably and immediately lost their settings when power was removed. The new design provides more consistent operation while preserving its programmed state, making it easier to reconfigure for different tasks.
The team believes the technology could eventually enable compact devices that control heat with the same precision that electronic circuits control electricity. Potential applications include smarter infrared emitters, improved thermal management systems, energy conversion technologies, and photonic memory devices that store information using light and heat instead of electrical charges.
