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The wavelength of emitted light grows, that is, the energy decreases, along the gold nanorod array. A Bose-Einstein condensate forms when an energy minimum of the lattice is reached. Credit: Aalto University / Tommi Hakala and Antti Paraoanu.
Researchers at Aalto University, Finland, have created a Bose-Einstein condensate of light coupled with metal electrons, so-called surface plasmon polaritons. Nearly 100 years ago, Albert Einstein and Satyendra Nath Bose predicted that quantum mechanics could force a large number of particles to behave in concert as if they were only a single particle. This form of matter was called a Bose-Einstein condensation, and it wasn't until 1995 that researchers created the first such condensate of a gas of alkali atoms.
Bose-Einstein - Condensations - Systems - Researchers - Limits
Although Bose-Einstein condensations have been observed in several systems, researchers are pushing the limits of the phenomenon—to faster timescales, higher temperatures, and smaller sizes. As creating these condensates becomes easier, more exciting routes open for new technological applications. New light sources, for example, could be extremely small in size and allow fast information processing.
Aalto researchers made condensed particles from mixtures of light and electrons in motion within gold nanorods arranged into a periodic array. Unlike most previous experimental Bose-Einstein condensates, the new condensate does not need to be cooled down to temperatures near absolute zero—because the particles are mostly light, the condensation could be induced in room temperature.
Gold - Nanoparticle - Array - Nanofabrication - Methods
"The gold nanoparticle array is easy to create with modern nanofabrication methods. Near the nanorods, light can be focused into tiny volumes, even below the wavelength of light in vacuum. These features offer interesting prospects for fundamental studies and applications of the new condensate," says Academy Professor Päivi Törmä.
The main hurdle in acquiring proof of the new kind of condensate...
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