Zhou Shi, Matthieu Davy, Jing Wang, Azriel Z. Genack
We exploit the evolution in time of the transmission matrix following pulse excitation of a random medium to focus radiation at a selected time delay t^\prime and position r. The temporal profile of a focused microwave pulse is the same as the incident Gaussian pulse. The contrast in space at time t^\prime of the focused wave is determined by the participation number of transmission eigenvalues M^\prime and the size N^\prime of the measured transmission matrix. The initial rise and subsequent decay in contrast observed reflects the distribution of decay rates of the quasi-normal modes within the sample.
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http://arxiv.org/abs/1305.0940
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