Tuesday, May 7, 2013

1305.0940 (Zhou Shi et al.)

Focusing through random media in space and time: a transmission matrix

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.
View original: http://arxiv.org/abs/1305.0940

No comments:

Post a Comment