Scientists have created an anti-laser for arbitrary waves

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A team of researchers has developed a three-dimensional anti-laser that is capable of almost completely absorbing one particular type of arbitrary wave..

A laser is an ideal light source that generates waves of a well-defined color. However, it is also possible to create an opposite device that perfectly absorbs specific waves and dissipates their energy almost completely.. Scientists from the Vienna University of Technology, together with colleagues from Nice, have developed a method for using this effect in very complex systems in which light waves propagate randomly in arbitrary directions..

With the help of mathematical calculations and computer modeling, physicists have proved that it is possible to create an ideal absorber, which, depending on the internal structure, will interact with certain radiation, preventing him «slip away». Until now, such antilasers have been implemented only in one-dimensional structures, on which waves were sent from opposite sides. However, the Austrians demonstrated that multidimensional complex structures can have similar properties..

The laboratory random anti-laser consists of a microwave chamber with a central absorbing antenna surrounded by randomly arranged Teflon cylinders. These cylinders reflect and deflect waves like rocks in a puddle with them, forming a complex picture. By directing radiation and measuring scattering, they characterize the internal structure of each object. Next, you can calculate the wave that «absorbed» central antenna and its strength. The developed technique allows to achieve absorption of 99.8% of the signal arriving at the object.

The effect is due to the fact that the incident wave splits into many parts that interfere with each other and, as a result, cannot escape..

Scientists have created an anti-laser for arbitrary waves

The technology is at an early stage of development, but has the potential to be applied in all technical disciplines related to wave phenomena. For example, in mobile communications or medicine.

We previously reported that physicists discovered exotic spiral electrons.

text: Ilya Bauer, photo: TU Wien

Scientists have created an anti-laser for arbitrary waves

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