A meta-laser that produces highly twisted light. Free Technical Library News

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Meta-laser that produces highly swirling light

10.05.2020

Scientists from Harvard University (USA), CSIR organization (South Africa), with the participation of colleagues from Singapore, Belgium and Italy, have developed and demonstrated the operation of the first meta-laser of its kind, which produces the so-called super-chiral light, the light with the largest present day value of angular momentum. The light of such a laser provides the highest level of interaction between matter and this light, and it can be used as an optical "wrench" or to encode large amounts of information transmitted through optical communication channels.

Judging by the presence of the prefix "meta" in the name of the new laser, its key component is the metasurface, which affects the light and changes its parameters every time this light passes through it. The metasurface was calculated and fabricated by Harvard scientists, it is a material whose surface is covered with many small (nanometer-sized) columns, the height, width and distance between which have been carefully calculated to obtain the desired effect. And when light passes through such a surface, it turns at a certain angle each time.

In addition to the fact that the created metasurface itself has a high phase gradient, it is capable of transmitting a sufficiently powerful light flux through itself without any disruption, which significantly pushes the boundaries of the use of such lasers.

As a result of all the measures and tricks described above, the new laser is capable of producing light with 100 times more angular momentum and 10 times more power than any other similar lasers created until recently. At the same time, the new laser provides the possibility of complete control over the angular momentum (AM), rotation (polarization) and orbital angular momentum (OAM) of the light beam emerging from it. And all that is required for this is just a change in a few parameters of the light used to pump the laser.

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