Time Reversal in Subwavelength-Scaled Resonant Media: Beating the Diffraction Limit
Figure 1
(a) Recording step: a closed surface is filled with transducer elements. A point-like source generates a wave front which is distorted by heterogeneities. The distorted pressure field is recorded on the cavity elements. (b) Time-reversed or reconstruction step: the recorded signals are time-reversed and reemitted by the cavity elements. The time-reversed pressure field backpropagates and refocuses exactly on the initial source.
