Physics

Operating system

Optics

Composite material

Electrical impedance

Materials science

Shear waves

Computer science

Phase (matter)

Mode (computer interface)

Quantum mechanics

Transmission (telecommunications)

Telecommunications

Shear (geology)

Applied Physics Letters

Achieving total mode conversion from longitudinal to shear waves for a broad incident angle has been a big scientific challenge in elastic fields, which was impossible to be achieved in classical elastic wave theory. In this paper, we propose and realize a refractive transmodal elastic metasurface that can convert an incident longitudinal wave to a shear wave for a broad incident angle. Here, the total mode conversion is achieved via a sufficiently large phase gradient, while the full transmission is achieved with the impedance-matched single-layered metasurface. Numerical and experimental investigations show that the proposed metasurface can provide almost total mode conversion for a broad incident angle from −20.4° to 22.3°. We expect that the proposed refractive transmodal metasurface can be applied in various ultrasonic systems.

Broad-angle refractive transmodal elastic metasurface