Các nhà nghiên cứu phát triển vật liệu có thể lập trình điều khiển nhiệt và ghi nhớ trạng thái

Researchers from Osaka Metropolitan University have developed a programmable thermal device that can control where heat is radiated while remembering its configuration even after power is removed, a capability that could one day contribute to smarter thermal management in high-performance chips, silicon photonics, infrared sensors, and energy-harvesting systems. The work, published in Laser & Photonics Reviews, overcomes two longstanding obstacles that have prevented the practical realization of nonreciprocal thermal devices. Go deeper with TH Premium: Chipmaking (Image credit: tsmc) A deeper look at the chipmaking supply chain TSMC's $165 billion U.S. investments examined China reportedly reverse-engineers EUV tool China bets on DUV, as EUV blockade reshapes chipmaking The device combines a magneto-optical material — a material that changes its optical properties in the presence of a magnetic field — with a phase-change material known as germanium-antimony-tellurium (GST) to independently control how a surface absorbs and emits infrared radiation. Unlike previous designs that lost their functionality once power was removed or only worked when light struck the surface at extreme angles, the researchers say their device operates almost straight on while retaining its programmed state without continuous energy input. Under normal circumstances, materials follow a principle stating that if a surface efficiently absorbs heat at a particular wavelength and direction, it must also emit heat equally well under the same conditions. This relationship, defined by Kirchhoff's law of thermal radiation, holds for conventional materials and limits how precisely engineers can manipulate heat. Rather than directing thermal energy where it is most useful, these materials simply emit heat based on how they absorb it. Circumventing this relationship has become an active area of research, as it could give engineers an entirely new way to control thermal energy. Devices capable of independently steering absorption and emission could improve radiative cooling, thermophotovoltaic systems that convert heat into electricity, infrared sensing, thermal communication, and other photonic technologies where controlling heat is just as important as controlling light. Researchers have explored several ways to achieve this by breaking Lorentz reciprocity, the physical principle that links incoming and outgoing electromagnetic waves. Most approaches rely on magneto-optical materials, magnetic Weyl semimetals, or actively modulated metasurfaces. However, these designs have generally encountered two major problems. First, they require light to strike the surface at very oblique, or grazing, angles to produce strong directional behavior. While this works experimentally, it significantly reduces the amount of usable thermal radiation and produces broad, inefficient emission patterns. Second, many existing designs are volatile. Their behavior disappears as soon as the magnetic field, electrical signal, or heating source controlling them is removed, making continuous power necessary simply to maintain their operating state. The Osaka Metropolitan University team tackled both limitations by combining two materials that perform complementary roles. The first is indium arsenide (InAs), a magneto-optical semiconductor whose interaction with infrared light changes in the presence of a magnetic field. Rather than allowing light to behave identically in all directions, the material introduces a directional asymmetry that enables nonreciprocal thermal behavior. The second ingredient is GST, a phase-change material that can reversibly switch between amorphous and crystalline states, dramatically changing its optical properties while retaining whichever state it is written into, even after power is removed. The researchers patterned GST into a microscopic grating above the InAs layer, forming what they describe as a magneto-optical metagrating. The InAs provides the…