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Stability of time reversed waves in changing media
1. | Department of Applied Physics and Applied Mathematics, Columbia University, New York NY, 10027, United States |
2. | Department of Mathematics, University of Chicago, Chicago IL, 60637, United States |
The refocusing quality of the backpropagated signal is determined by the cross correlation of the two media. When the two media decorrelate, two distinct de-focusing effects are observed. The first one is a purely absorbing effect due to the loss of coherence at a fixed frequency. The second one is a phase modulation effect of the refocused signal at each frequency. This causes de-focusing of the backpropagated signal in the time domain.
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