All articles tagged with #thermal radiation
Researchers developed a multilayer metamaterial that exhibits stronger infrared emission than absorption under a magnetic field, breaking traditional reciprocity laws and opening new possibilities for heat management and energy technologies.
Researchers have successfully conducted the first near-field thermal radiation measurement between subwavelength nanodevices, breaking Planck's Law at the nanoscale. By fabricating an advanced instrument, they observed a 20-fold enhancement in heat transfer between two subwavelength surfaces with a separation gap of 150 nm, providing new insights into energy transport physics within nanodevices. This foundational physics has the potential to impact thermal engineering and photonics in the future.
Scientists have discovered an exception to Fourier's law, a 200-year-old scientific law governing heat diffusion through solid materials. Researchers found that in translucent materials, heat can also travel through thermal radiation in addition to diffusion, challenging traditional understanding. The study suggests that structural imperfections in these materials act as heat absorbers and sources, allowing heat to propagate internally. This discovery could lead to new strategies for heat management in translucent materials and expands our understanding of heat transmission in solids.
Researchers have developed a device that can violate Kirchhoff's law of thermal radiation, which states that an object's absorption and emission efficiencies are equal. This breakthrough could have significant implications for energy harvesting systems and camouflage technology. The device combines a material with a strong magnetic-field response and a patterned structure to enhance absorption and emission in infrared wavelengths. By decoupling the absorptive and emissive properties of objects, higher energy conversion efficiencies can be achieved. This experimental proof challenges a law that has been upheld for over 150 years.
Researchers at Caltech have developed a device that breaks Kirchhoff's law of thermal radiation, which states that absorptive and emissive efficiencies are equal. By decoupling the absorptive and emissive properties of a material, the device could lead to more efficient energy harvesting systems and advancements in camouflage technology. The device combines a material with a strong magnetic-field response and a patterned structure to enhance absorption and emission in infrared wavelengths. This breakthrough could have significant implications for sustainable energy technologies.