Vortex structures are widespread in the Universe: these are, for example, whirlpools, smoke rings, tornadoes and
Scientists have designed metasurfaces thatThey form light rays 100 times thinner than a human hair and twist them like a corkscrew into an optical vortex. The researchers placed the created structures inside a laser resonator, in which light is continuously reflected from two mirrors. The device provided interaction between light vortices. Each stream of light inside the nanocrystal was tuned in the process of interaction with other vortices.
The metasurface array confers orbital angular momentum ???? to the vortex crystal.
Then, as the vortices propagate in the laser, they mix together until when a self-image–in both intensity and phase–is produced (Talbot effect)
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— Marco Piccardo (@PiccardoM) July 27, 2021
According to the researchers, the uniquea feature of the metasurface laser they created is the ability to arbitrarily control the orbital angular momentum of light and thereby correct topological defects. According to the scientists, such lasers can be used as reliable universal resonators in topological optics.
Here is the defect healing in action
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— Marco Piccardo (@PiccardoM) July 27, 2021
Physicists believe that technology has a widepotential. It can be used both for studying processes in the quantum world, for example, by creating reliable skyrmions, and for modeling the processes of complex physical systems, such as interacting galaxies or hydrodynamic vortices.
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Regions of a periodic crystal structure in which the symmetry of the crystal is broken and one topological phase is replaced by another.
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