What is it about?
There are limits to how much energy can be absorbed within a given region of space, but these limits do not apply to absorbers that include a second source of energy. This paper demonstrates that a pulse of energy sent into a cavity can be completely withdrawn by sending a second pulse into the cavity. Although this may sound counter-intuitive, this result is shown theoretically and experimentally.
Why is it important?
Active absorption of pulses has been addressed using time-reversal techniques. Here, we have shown a different method that relies on the geometry of the cavity and shape (modulation) of the pulse, but is not time-reversal.
Read the Original
This page is a summary of: Active absorption of electromagnetic pulses in a cavity, New Journal of Physics, May 2015, Institute of Physics Publishing, DOI: 10.1088/1367-2630/17/5/053050.
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