论文标题
部分可观测时空混沌系统的无模型预测
Anomalous wavefront control via nonlinear acoustic metasurface through second-harmonic tailoring and demultiplexing
论文作者
论文摘要
我们通过利用由弯曲梁形成的局部谐振单位细胞的非线性来提出非线性声学跨表面概念。建立了分析模型以探索非线性现象，特别是声波指导的第二谐波产生（SHG），并通过数值和实验研究验证。新型的非线性声学跨膜是发展为消除不同频率分量的，并实现了传播区域中SHG的异常波前控制。为此，我们演示了波动转向，焦点和自弯曲的传播。我们的结果表明，所提出的非线性跨表面提供了一个有效，有效的平台，以实现重要的SHG，并将不同的谐波组件分开以控制单个谐波的波前控制。总体而言，这项研究为探测声波剪裁的线束非线性效应提供了新的途径，并为高级技术开发了操纵声波的新潜力。
We propose a nonlinear acoustic metasurface concept by exploiting the nonlinearity of the 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 acoustic waveguide and validated through numerical and experimental studies. Novel 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 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 new avenues to harness nonlinear effects for acoustic wavefront tailoring and develops new potential toward advanced technologies to manipulate acoustic waves.
