声波前操纵：阻抗不均匀性和异常反射
Acoustic Wavefront Manipulation: Impedance Inhomogeneity and Extraordinary Reflection
摘要：
利用具有相位不均匀性的基元光束干涉可以实现波前的控制。因此，允许巨大的、突然的和位置变化的相位变化的表面将使波前工程的所有可能性成为可能。然而，在声学中，人们可能没有高效相变材料的奢侈品。这促使我们建立声学的对应机制，以使新的声学应用范围更广。值得注意的是，所提出的阻抗支配的广义斯涅耳定律（IGSL）的反射是区别于光学。通过操纵不均匀的声阻抗，非常反射可以定制为前所未有的波前操纵，而普通反射可以令人惊讶地打开或关闭。我们的研究结果可能为声波操纵和工程提供动力。我们展示了新的声学应用与IGSL设计的平面表面。
英文摘要：
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.
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