Time Reversal in Subwavelength-Scaled Resonant Media: Beating the Diffraction Limit
Figure 2
(a) Typical focusing experiment using TR. A multiple scattering medium is placed between the TRM and a point-like sensor. The size of the focal spot obtained with TR is no longer limited by the aperture of the TRM but rather by that of the multiple scattering medium. (b) Simplified view of a single channel TR focusing experiment realized in a silicon cavity. The field produced by TR at the collapse time is scanned using a heterodyne interferometer, and its map is superimposed on the cavity: a diffraction limited spot is obtained using only one emitter.
