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Current issue

ELEKTRO 1/2020 was released on January 20th 2020. Its digital version will be available on February 12th 2020.

Topic: Electrotechnology; Materials for electrical engineering; Wiring materia

Main Article
Using mHealth technolgy for automated data collection and transmission

SVĚTLO (Light) 6/2019 was released on December 9th 2019. Its digital version will be available on January 9th 2020.

Professional organizations activities
Light technology konference of Visegrád countries LUMEN V4 2020 – 1st announcement
23rd International conference SVĚTLO – LIGHT 2019
56th Conference of Society for development public lighting in Plzeň
What is new in CIE

Interiors lighting
Halla illuminated new Booking.com offices in Prague centre

New property of light discovered

01.07.2019 | Phys.org | www.phys.org

A team of researchers affiliated with several institutions in Spain and the U.S. has announced that they have discovered a new property of light—self-torque. In their paper published in the journal Science, the group describes how they happened to spot the new property and possible uses for it.

Scientists have long known about such properties of light as wavelength. More recently, researchers have found that light can also be twisted, a property called angular momentum. Beams with highly structured angular momentum are said to have orbital angular momentum (OAM), and are called vortex beams. They appear as a helix surrounding a common center, and when they strike a flat surface, they appear as doughnut-shaped. In this new effort, the researchers were working with OAM beams when they found the light behaving in a way that had never been seen before.

New property of light

The experiments involved firing two lasers at a cloud of argon gas—doing so forced the beams to overlap, and they joined and were emitted as a single beam from the other side of the argon cloud. The result was a type of vortex beam. The researchers then wondered what would happen if the lasers had different orbital angular momentum and if they were slightly out of sync. This resulted in a beam that looked like a corkscrew with a gradually changing twist. And when the beam struck a flat surface, it looked like a crescent moon. The researchers promptly dubbed the new property self-torque—and not only is it a newly discovered property of light, it is also one that has never even been predicted.

Read more at Phys.org

Image Credit: CC0 Public Domain

-jk-