Anomalous wavefront control via nonlinear acoustic metasurface through second-harmonic tailoring and demultiplexing
Anomalous wavefront control via nonlinear acoustic metasurface through second-harmonic tailoring and demultiplexing
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DOI：
10.1063/5.0101076
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发表时间：
2022-05
影响因子：
4
通讯作者：
Zhen Lin;Yuning Zhang;Kon-Well Wang;S. Tol
中科院分区：
文献类型：
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作者：
Zhen Lin;Yuning Zhang;Kon-Well Wang;S. Tol
我们通过利用曲梁形成的局部共振单元的非线性，提出了非线性声学元表面概念。分析模型的建立，探索非线性现象，特别是二次谐波产生（SHG）的非线性单胞，并通过数值和实验研究进行验证。通过调整单胞的相位梯度，设计了非线性声学超颖表面，实现了不同频率分量的分离，实现了透射区二次谐波的异常波前控制。为此，我们数值演示波转向，波聚焦，和自弯曲传播。我们的研究结果表明，所提出的非线性元表面提供了一个有效的和高效的平台，以实现显着的SHG和分离不同的谐波分量的波前控制的个别谐波。总的来说，这项研究提供了一个前景，利用非线性效应的声波前剪裁和开发先进技术来操纵声波的潜力。
We propose a nonlinear acoustic metasurface concept by exploiting the nonlinearity of locally resonant unit cells formed by curved beams. The analytical model is established to explore the nonlinear phenomenon, specifically the second-harmonic generation (SHG) of the nonlinear unit cell, and validated through numerical and experimental studies. By tailoring the phase gradient of the unit cells, nonlinear acoustic metasurfaces are developed to demultiplex different frequency components and achieve anomalous wavefront control of SHG in the transmitted region. To this end, we numerically demonstrate wave steering, wave focusing, and self-bending propagation. Our results show that the proposed nonlinear metasurface provides an effective and efficient platform to achieve significant SHG and separate different harmonic components for wavefront control of individual harmonics. Overall, this study offers an outlook to harness nonlinear effects for acoustic wavefront tailoring and develops potential toward advanced technologies to manipulate acoustic waves.