Scientists invent a new method of generating intense short UV vortices

phys.org | 5/7/2019 | Staff
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An international group of scientists, including Skoltech Professor Sergey Rykovanov, has found a way to generate intense "twisted" pulses. The vortices discovered by the scientists will help investigate new materials. The results of their study were published in Nature Communications.

Electromagnetic waves are known to carry energy and momentum and exert the so-called light pressure. This was demonstrated experimentally by the Russian physicist, Pyotr Lebedev, back in 1900. A little-known fact is that electromagnetic waves can also carry the angular momentum, that is, twist objects. The angular momentum (twisting ability) can be transferred in two ways. First, an object can be irradiated by an elliptically or circularly polarized electromagnetic wave to produce the rotational moment, creating the Sadovsky effect. Second, the substance can be twisted by electromagnetic waves with a "vortex" wave structure or, scientifically speaking, waves with an orbital angular momentum (OAM). Visible or IR-range electromagnetic pulses with such capability are already used in telecommunications to increase the data...
(Excerpt) Read more at: phys.org
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