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Illustration of the basic time-reversal imaging concept. The scattered fields at the detection screen are used as the input to Eq. (1) in order to backpropagate the waves to the input aperture plane .
(a) Illustration of the pump and probe imaging experiment (close-up of sample in cryostat). (b) Change in reflectivity vs delay time for a single probe spot at off axis.
lines. The scale bar in the top left corner of each picture represents a length of . (a) Reconstructed acoustic image of the Al lines (from data). The image shown is a linear gray-scale plot. The dashed white line indicates the line out used for (d). (b) SEM image of the Al lines. Note that the scale is different for this picture than for the others. (c) Reconstructed image of the Al lines from the same data set that produced (a) but without the anisotropic group velocity. (d) Line out of the reconstruction amplitude vs position for the data shown in (a). The distance (indicated by the arrows) between the 10% (peak-to-peak value) point and the 90% point for the edge of the line indicated in the plot is .
grid. The scale bar in the top left corner of each picture represents a length of . (a) Reconstructed acoustic image. (b) SEM image. Note that the scale is different for the two images.
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