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Homogenization and design of acoustic Willis metasurfaces
Physical Review B ( IF 3.7 ) Pub Date : 2021-02-26 , DOI: 10.1103/physrevb.103.054306
Hussein Esfahlani , Yarden Mazor , Andrea Alù

Metasurfaces are ultrathin planar arrays of carefully tailored subwavelength particles that enable agile and flexible manipulation of the impinging waves. Originally introduced in optics, their application to acoustic waves has recently opened exciting opportunities for exotic sound control. In conventional acoustic inclusions, the interactions with the impinging pressure and velocity are decoupled, limiting the functionalities that arrays of them can achieve. While the coupling between these two quantities in symmetry-breaking inclusions, known as Willis coupling, has been discussed for several years, only recently has it been realized that these phenomena can become nonperturbative in suitably tailored resonant scatterers. Here, we explore the opportunities that these Willis meta-atoms open in the context of acoustic metasurfaces, offering additional knobs to manipulate and tailor sound. The general response of Willis metasurface is analytically derived, yielding fundamental bounds and optimal surface responses enabling full control of the impinging acoustic wave front.

中文翻译:

声学威利斯超表面的均质化和设计

超表面是精心定制的亚波长粒子的超薄平面阵列,能够对入射波进行灵活灵活的操纵。最初在光学中引入,它们在声波中的应用最近为奇特的声音控制打开了令人兴奋的机遇。在常规的声学夹杂物中,与撞击压力和速度的相互作用是分离的,从而限制了它们的阵列可以实现的功能。虽然已经讨论了对称破缺夹杂物中这两个量之间的耦合(称为威利斯耦合),但直到最近才意识到,在适当定制的共振散射体中,这些现象可以变得无扰动。在这里,我们探索在声学超表面的背景下这些威利斯超原子打开的机会,提供额外的旋钮来操纵和定制声音。威利斯超表面的一般响应是通过分析得出的,从而产生基本边界和最佳表面响应,从而可以完全控制撞击声波前。
更新日期:2021-02-26
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