The breakthrough experiment could lead to low-energy, wave-based computers and new applications for wireless communications.
Researchers at the Advanced Science Research Center at the CUNY Graduate Center performed a breakthrough experiment in which they observed time reflections of electromagnetic signals in a tailored metamaterial., were able to successfully cause time reversal as well as frequency conversion of broadband electromagnetic waves in their experiments.
Unlike spatial reflections, which occur when light or sound hits an adequate boundary, time reflections happen when the entire medium a wave travels suddenly alters its properties across all of space. When this happens, a portion of that wave is time-reversed, and its frequency is converted to a new one.
"This has been really exciting to see, because of how long ago this counterintuitive phenomenon was predicted," corresponding author Andrea Alù, founding director of the CUNY ASRC Photonics Initiative explained in
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