Researchers replicated the classic double slit experiment using lasers, but their slits are in time not space.
The new experiment is a twist on a 220-year-old demonstration, in which light shines through two slits in a screen to create a unique diffraction pattern across space, where the peaks and troughs of the light wave add up or cancel out. In the new experiment, researchers created a similar pattern in time, essentially changing the color of an ultrabrief laser pulse.
"This was a very big surprise and at the beginning it was something that we couldn’t explain," study lead author Riccardo Sapienza , a physicist at the Imperial College London, told Live Science. Eventually, the researchers figured out why the reaction happened so fast by scrutinizing the theory of how the electrons in ITO respond to incident light. "But it took us a long time to understand it.
Whereas passing through conventional spatial slits causes light to change direction and fan out, as the light passed through these twin"time slits," it changed in frequency, which is inversely related to its wavelength. It is the wavelength of visible light that determines its color. Andrea Alù , a physicist at The City University of New York who was not involved with these experiments but has done separate experiments that created reflections of light in time, described it as yet another“neat demonstration” of how time and space can be interchangeable..
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