This article reports on the design, numerical simulation, fabrication, and experimental test of an acoustic planar retroreflector capable of effectively reflecting sound along its incident direction for a wide operating angle range (0-70). The proposed acoustic planar retroreflector is a compound of two cascaded metasurfaces: a transmissive surface that converges the incident beam onto a second planar surface placed behind it, which serves as a reflective surface that bounces the beam back along the incident direction. Both the simulated and measured results provide evidence of the sound retroreflection effect. The structure proposed here provides a possible strategy for improving medical ultrasound, underwater communication, and illusion device design.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy (miscellaneous)