PHYSICS WORLD
Fluctuational electrodynamics in action
In a new experiment, a silica fibre just 500 nm across has been shown not to obey Planck’s law of radiation. Instead, say the Austrian physicists who carried out the work, the fibre heats and cools according to a more general theory that considers thermal radiation as a fundamentally bulk phenomenon. The work might lead to more efficient incandescent lamps and could improve our understanding of the Earth’s changing climate, argue the researchers.
A cornerstone of thermodynamics, Planck’s law describes how the energy density at different wavelengths of the electromagnetic radiation emitted by a “black body” varies according to the temperature of the body. It was formulated by German physicist Max Planck at the beginning of the 20th century using the concept of energy quantization that was to go on and serve as the basis for quantum mechanics. While a black body is an idealized, perfectly emitting and absorbing object, the law does provide very accurate predictions for the radiation spectra of real objects once those objects’ surface properties, such as colour and roughness, are taken into account.
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