Scientists experimenting with some of the most fundamental laws of physics have found more evidence of what they're calling photonic time crystals (PTCs): materials in which the speed at which light moves (the refractive index) oscillates very quickly.
, which have much lower frequencies than light waves – the faster the waves pass, the higher the frequency. Keeping PTCs stable depends on the refractive index rising and falling in the space of a single electromagnetic wave cycle.
That's much more challenging in the super-speedy realm of light waves, which is part of what makes these experiments so interesting. The researchers weren't quite able to observe PTCs in theAs Segev says, it's not clear precisely why this is happening or how it might eventually be used, but we're talking about breaking new ground in physics – a"new chapter in the", according to Vladimir Shalaev, an electrical engineer at Purdue University in the US.
"Our findings… pave the way for observing photonic time crystals at optical frequencies, and many other phenomena involving time boundaries,"
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