In the past few days, researchers at Utrecht University have developed the Opaque material penetrating light waves. These waves occur on the tempestuous water surface in an infinite number of different shape. These waves can also occur in unlimited varying forms. Stefan Rotter, along with his team, has invented mathematical ways to elaborate the light scattering effects. So, the main characters for its production such as complex light fields were all given by the team around Prof. Allard Mosk at Utrecht University.
“As a light-scattering medium, we used a layer of zinc oxide— an opaque, white powder of completely randomly arranged nanoparticles,” explains Allard Mosk, the head of the experimental research group. “Each of these light wave patterns is changed and deflected in a very specific way when you send it through a disordered medium,” explains Prof. Stefan Rotter from the Institute of Theoretical Physics at TU Wien.
Initially, the layer is to be accurately and precisely characterized. Thus, the material under observation reflects to the specific light signals through the zinc oxide powder. In addition, the measurement is done of how they arrive at the detector behind it. With all this process, it can be concluded how any other wave is changed by this medium—in particular. It can calculate specifically by noticing the wave pattern changed by the zinc oxide layer exactly as it would wave scattering the entirely absent in this layer.
So, as the special and rare case, these scattering-invariant light modes can be with the theoretically limitless number of possible light waves. Thus, it is impossible for anyone to find many of them. And if several of these scattering-invariant light modes are combined in a right way, a scattering-invariant waveform is created again.
“In this way, at least within certain limits, you are quite free to choose which image you want to send through the object without interference,” says Jeroen Bosch, who worked on the experiment as a Ph.D. student.