Scientists were able to force electromagnetic waves that usually pass through each other to encounter, manipulating time. This breakthrough was made possible thanks to the unique properties of metamaterials.
Inspired by the concept of using macroscopic waves, like tsunami or earthquakes, to mutually extinguish each other, the manipulation of temporal interfaces opens up new possibilities for engineering applications. This includes advancements in telecommunications, optical calculations, and even energy collection.
While stopping a tsunami with an oncoming wave was deemed impossible in classical physics, the potential for such an occurrence at the quantum level has long been theorized. “Using a temporary metamaterial, we demonstrate this principle on electromagnetic waves,” explained Emanuele Galiffi from Cuny Graduate Center.
The key to creating this collision of waves lies in manipulating time using metamaterials. Although this idea has been discussed for over six decades, it was only recently that a team from Cuny ASRC proved the existence of temporary reflections by utilizing a new metamaterial.
Professor Andrea Alù, the lead researcher, stressed that this latest study showcases how temporary changes in metamaterials can cause electromagnetic waves to collide—a phenomenon never observed at the subatomic level before.
“Through the complex design of metamaterials, we were able to create conditions that drastically and sharply alter the properties of the material over time, resulting in the first observed evidence of time reflection,” explained Alù.
One practical application of this discovery is the ability to generate electromagnetic pulses by colliding waves. “We have already demonstrated this capability with radio waves and are now pursuing further applications,” said Gengyu XU, a researcher at Alù’s laboratory.
In conclusion, the researchers highlighted that the ability to encounter electromagnetic waves could lead to breakthroughs in various fields, such as wireless communications, energy collection, imaging, and calculations.