Fig. 3: Demonstrating focusing in the Single-input/single-output scenario.
From: Reconfigurable and active time-reversal metasurface turns walls into sound routers
a Representative snapshots for five different time of the two-dimensional scan around the receiver’s location consecutive to a Dirac emission from the emitter. The dashed gray circles outline the approximately isotropic spherical wavefront converging toward the focal point x = y = 0 at t = 0. b Measured signal at the focal point revealing a nice broadband temporal focusing. c Cuts along x and y (passing through the focal point) of the two-dimensional scan around the receiver’s location revealing the spatial focusing. d One-dimensional scan around the emitter’s location while the receiver stay at the focal point revealing spatial focusing on the emitter side.
