The team of physicists recently succeeded in making an astonishing achievement. Although researchers have already succeeded in “turning the clock” for all types of waves, this new study addresses a very difficult problem: light.
Before we begin, let’s clarify one thing: it won’t be about going aboard In order to go back in time to the danger of our lives, but to withdraw the thread of an event from its final state. Let’s mention.
Imagine dropping a frame into a shapeFlattened in a swimming pool. At the moment of contact between the object and the water, a disturbance is created and the resulting wave propagates towards the outside. To reach its walls, as Those created by a boat crossing occasionally fold against the shore. Imagine that the edges of a swimming pool are capable of recording these ripples and then reproducing them in the opposite direction, returning their path to their initial position. This is what the team of researchers was able to achieve in 2016, and the results are astounding. Under the stimulation of the moving walls of the pond, the waves take shape and meet at the center of the pond, recreating the shape that initially hit the surface!
This experiment was carried out by Pagot et al. 2016 shows how reproduction manages the waves emitted by the fall of a form (Eiffel Tower) in the water, which allows them to focus on their early stages. © Pagot et al.
A “time mirror”
This comment ” To accurately measure and reproduce, the same is not true Know, It is very high, which makes it very vulnerable to disturbances. Where the waves Used by satellites can be easily overcome Without significant change, the light is scattered. A perfect observation is impossible Round through a : Its rays are scattered by cloud-forming droplets.Temporary ”is also used Or electromagnetic, but light waves are very difficult to detect. If the microwave used in other experiments
That is why Very enjoyable! ” Imagine sending a small pulse one way from a small point Will vary like a fog, Explains physicist Michael Mounix. Light starts from a point in space and time, but scatters as it passes Come to the other side at different places and at different times. We found a way to accurately measure where and when this scattered light is coming from, and then create a “glass” version of that light and send it back through the fog. [dans son état de départ jusqu’à son point initial]. »
What’s the use?
The demonstration is beautiful, but some will not fail to retaliate. “ Okay, so what? Therefore, basic research, on the one hand, is an important stage in applied research. If one does not read an event in the first place, no matter how harmless it may seem, one is not likely to discover astonishing properties.That he can hide.