Fabrication and experimental demonstration of a hybrid resonant acoustic gradient index metasurface at 40 kHz
Fabrication and experimental demonstration of a hybrid resonant acoustic gradient index metasurface at 40 kHz
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DOI：
10.1063/1.5095963
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发表时间：
2019-06-10
影响因子：
4
通讯作者：
Jing, Yun
中科院分区：
文献类型：
--
作者：
Gerard, Nikhil J. R. K.;Cui, Huachen;Jing, Yun
在过去的几年里，声学梯度折射率超颖表面（GIM）已经被积极研究，因为它们促进了许多波控制能力。然而，以前的研究主要集中在GIM，在可听频率范围内工作，由于在毫米和亚毫米尺度制造这种复杂的结构，超声应用的困难。在这项工作中，我们设计，制造和实验证明的工作的混合共振声梯度折射率元表面的机载超声在40 kHz。这种GIM的制造可以通过投影微立体光刻（一种新兴的增材制造技术）来实现。进行了数值模拟，以验证超颖表面的设计，并进行了实验，以证实这些模拟。本文重点介绍了与机载超声相关的较强耗散。这种超颖表面的机载超声的实验演示可以进一步其作为小型化声学设备的候选人的前景。
Over the past few years, acoustic gradient index metasurfaces (GIMs) have been actively studied for the numerous wave control capabilities that they facilitate. Previous research, however, has primarily focused on GIMs that operate in the audible frequency range, due to the difficulties in fabricating such intricate structures at the millimeter and submillimeter scales, for ultrasonic applications. In this work, we design, fabricate, and experimentally demonstrate the working of a hybrid resonant acoustic gradient index metasurface for airborne ultrasound at 40kHz. The fabrication of such a GIM is made possible by projection microstereolithography, an emerging additive manufacturing technique. Numerical simulations were conducted to verify the metasurface design, and experiments were performed to corroborate these simulations. The stronger dissipation associated with airborne ultrasound is highlighted in this paper. The experimental demonstration of such a metasurface for airborne ultrasound could further its prospects as a candidate for miniaturized acoustic devices.