Even scattered objects such as clouds or sugar cubes cast shadows because they are -
A disordered environment is essentiallya collection of randomly spaced particles such as powder, sand, sugar, or even a cloud. When light hits this group of tiny obstacles, it scatters in incredibly complex ways. But theoretically, if you could figure out this scattering pattern, you could manipulate the light waves so that they pass without scattering.
Researchers have recently succeeded in doing just that by using zinc oxide as the scattering medium, with the light source placed on one side and the detector on the other.
To begin with, the team sent through the powderspecific light signals, and then measured how they entered the detector. Using some sophisticated mathematical techniques, it is possible to determine the nature of the scattering and create a specific light wave that does not change the waveform at all. The beam of light only dimmed slightly.
“As we were able to show, there is a special classlight waves - so-called light modes, invariant to scattering, which create exactly the same wave pattern on the detector, regardless of whether the light wave was sent only through the air or it had to penetrate a complex layer of zinc oxide, ”explains Stefan Rotter , co-author of the study.
As intriguing as the idea isunhindered penetration of light through the obstacle, the team of scientists went even further. By correctly connecting several scattering invariant light modes, they created a light wave encoded with an image - in this case the constellation Ursa Major - and projected it onto a detector via zinc oxide.
New work builds on previous experimentscommands to manipulate light waves to mask objects such as the invisibility cloak. The study could lead to new imaging techniques that allow you to see safely through the body, such as X-rays. However, there is still a lot of work to be done before such a technology is implemented.
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