A recent study published in the journal Nanophotonics shows that the refractive index, which is the ratio of the speed of electromagnetic radiation in a material to that in a vacuum, can be adjusted quickly enough to produce photonic time crystals (PTCs) in the near-visible region of the spectrum.

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Indiana , United States , Purdue University , Israel , Megan Craig , Alexandra Boltasseva , Vladimir Shalaev , Mordechai Segev , Israel Institute Of Technology , Photonics Time Crystals , New Field , Technion Israel Institute , Study Lead Author , Electrical Engineering ,