Novel âscattering-invariantâ light mode probes opaque materials 15 Apr 2021 Researchers at Utrecht and TU Vienna develop new form of light waves that travel through opaque materials. Big Dipper: a beam passes undisturbed through a disordered medium. Click for info.Researchers at Utrecht University, The Netherlands, and at TU Wien (Vienna, Austria) have created a special type of lightwaves that can penetrate opaque materials and pass through â as if the material were not obstructing or interrupting them. The scientists say that, for any specific disordered medium, the tailor-made light beams can be constructed that are practically not changed by the medium, but only attenuated.