Researchers have discovered that a perfect absorber of electromagnetic waves they described in a 2017 paper can easily be tweaked into a sort of 'time-reversed laser' known as a coherent perfect absorber (CPA).
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190215110247.htm
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190215110247.htm
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