A material has been created that emits a narrow spectrum of light when heated. Free Technical Library News

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Created a material that emits a narrow spectrum of light when heated

30.03.2020

Physicists at Rensselaer Polytechnic Institute have synthesized a three-dimensional tungsten photonic crystal - a material that can control the properties of a photon - with six shifted layers. Its crystal structure is similar to diamond, and the material itself also has an optical resonator, which further narrows the emission spectrum. The photonic crystal itself compresses the emitted spectrum of light to a range of about one micrometer. The resonator allows you to narrow this value to 0,07 micrometers.

While testing the new material, the scientists placed it on a silicon substrate side by side with a blackbody made from carbon nanotubes. In the experiment, the authors heated the materials up to 600 K and measured the spectrum of the radiation emitted by them. It turned out that the emission peak falls at a wavelength of 1,7 micrometers, corresponding to the infrared range. Moreover, the intensity of such radiation is eight times higher than that of a black body.

Although the current theory is not yet fully able to describe the observed phenomena, scientists suggest that they are associated with the displacement of the layers of the photonic crystal and allow light to escape from many spaces within its structure. Photons bounce off a large number of obstacles in the crystal structure of the material and change their characteristics.

The new material can be used in areas such as energy collection, tracking and identification of military targets based on infrared radiation, and the production of high-performance optical sources in the infrared range. It will also find application in IR spectroscopy and optics as a component of an infrared laser.

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