Mirrors made of 1000 atoms were created. Free Technical Library News

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Created mirrors of 1000 atoms

12.10.2016

Working independently, two teams of physicists in France and Denmark have created the smallest mirrors in the world. It's just that you can't see yourself in them.

"Mirrors" of one and two thousand atoms are suspended in space like a string of beads. By controlling the distance between atoms, scientists can quickly change the optical properties of a mirror. In the limit, it is able to reflect 75% of the light directed at it.

Ordinary mirrors made of polished metal reflect light from the generalized electrons in the metal, which emit light when excited by a stream of photons directed at the mirror. In the mirrors of Danish and French scientists, a different principle is used, based on Bragg diffraction - strong scattering of waves of a certain length on a periodic scatterer grating. Unlike ordinary mirrors, which reflect the entire visible spectrum, Bragg mirrors only reflect certain wavelengths. This property is very valuable for fiber optic technology, in which signal transmission is carried out by light with a well-defined wavelength.

A beam incident on a crystal lattice is successively reflected from each of its layers. All reflected waves interfere. Ghyb under certain conditions, the wave is reflected strictly to where it came from - this phenomenon is called Bragg diffraction.

You can change the distance between atoms in a chain using bursts of light flashes. Scientists believe that their invention can be useful for improving the quality of fiber-optic data transmission and for retaining qubits in quantum systems.

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Children and noise 02.01.2003

Recently in Munich (Germany) the old airport was closed and at the same time a new one was opened in another part of the city. This case was used by psychologists in order to identify the impact of noise from jet liners on the mental activity of children.

326 children with an average age of 10 years old living near the old and new airports were studied. Six months before the airport moved to a new location and six months after the move, the children's ability to read, remember what they read, comprehend speech and concentrate was tested.

It turned out that prolonged exposure to noise significantly worsens these indicators. One consolation: six months after the roar of jet engines stopped, the children freed from it caught up with their peers in their abilities.

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