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).

精心设计的盘绕形超表面可用于获得出色的水下隔音效果。在这封信中，我们提出了一种螺旋形形式的准完美吸音超表面。该螺旋形超表面（SM）满足完美吸收的两个条件，即在出口处没有透射并且在入口处没有反射。通过数值模拟研究了SM的吸声特性。仿真结果表明，完善的吸声峰值频率可以在频谱范围内灵活调节，这取决于参数的设计。频率可控的SM具有准完美的吸声系数（高达0.998）。