Reconfigurable spiral underwater sound-absorbing metasurfaces

A well-designed coiled metasurface can be applied to obtain extraordinary underwater sound isolation. In this letter, we propose a quasi-perfect sound-absorbing metasurface in spiral shape form. This spiral metasurface(SM) meets the two conditions for perfect absorption, which are no transmission at the outlet and no reflection at the inlet. The sound-absorbing characteristics of the SM are investigated through numerical simulation. The simulation results show that the peak frequency of prefect sound absorption can be tuned flexibly over the spectrum, which depends on the design of the parameters. The frequency-controllable SM has quasi-prefect sound absorption coefficient(up to almost 0.998). (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A well-designed coiled metasurface can be used for extraordinary underwater sound isolation, as proposed in this letter with a quasi-perfect sound-absorbing metasurface in spiral shape form. The metasurface meets the conditions for perfect absorption and can flexibly tune the peak frequency of sound absorption, showing a quasi-prefect sound absorption coefficient of up to almost 0.998.