标题： 声波前操控：阻抗非均匀性和异常反射 显示英文标题

标题： Acoustic Wavefront Manipulation: Impedance Inhomogeneity and Extraordinary Reflection

摘要： 光学波前可以通过干涉具有相位非均匀性的基本光束来操控。因此，允许巨大、突变且位置相关的相位变化的表面将能够实现波前工程的所有可能性。然而，在声学领域，我们可能无法拥有高效的突变相位变化材料。这促使我们建立一个声学领域的对应机制，以赋予新型声学应用广泛的潜力。值得注意的是，所提出的反射广义折射定律（IGSL）与光学中的有所不同。通过操控非均匀声阻抗，可以对异常反射进行定制，从而实现前所未有的波前操控，同时普通反射也能被意外地开启或关闭。我们的研究结果可能会推动声波操控和工程的发展。我们通过基于IGSL设计的平面表面展示了新颖的声学应用。 显示英文摘要

摘要： Optical wavefront can be manipulated by interfering elementary beams with phase inhomogeneity. Therefore a surface allowing huge, abrupt and position-variant phase change would enable all possibilities of wavefront engineering. However, one may not have the luxury of efficient abrupt-phase-changing materials in acoustics. This motivates us to establish a counterpart mechanism for acoustics, in order to empower the wide spectrum of novel acoustic applications. Remarkably, the proposed impedance-governed generalized Snell's law (IGSL) of reflection is distinguished from that in optics. Via the manipulation of inhomogeneous acoustic impedance, extraordinary reflection can be tailored for unprecedented wavefront manipulation while ordinary reflection can be surprisingly switched on or off. Our results may power the acoustic-wave manipulation and engineering. We demonstrate novel acoustic applications by planar surfaces designed with IGSL.