Acoustic mirage in two-dimensional gradient-index phononic crystals
Acoustic mirage in two-dimensional gradient-index phononic crystals
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DOI：
10.1063/1.3213361
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发表时间：
2009-09-01
影响因子：
3.2
通讯作者：
Huang, Tony Jun
中科院分区：
文献类型：
--
作者：
Lin, Sz-Chin Steven;Huang, Tony Jun
我们设计了一种二维梯度折射率声子晶体（GRIN PC）结构，有效地展示了波长尺度上的“声学海市蜃楼”效应。使用GRIN PC，通过逐渐调整PC的填充率，声波的传播方向可以沿着沿着弧形轨迹连续弯曲。我们通过平面波展开和时域有限差分方法研究了声海市蜃楼效应。通过控制入射角或工作频率，声波传播的弧形轨迹可以动态调整。GRIN PC结构由钢圆柱体组成，放置在正方形网格中，并浸入环氧树脂中。它可以通过简单的工艺制造，并与现有的声学设备无缝集成。此外，我们建立了这样的声学效应可以用于可调谐声波波导的设计，这可能会发现在声学开关，过滤和生物传感的应用。
We report the design of a two-dimensional gradient-index phononic crystal (GRIN PC) structure, which effectively demonstrates the "acoustic mirage" effect on the wavelength scale. Using the GRIN PC, the propagating direction of acoustic waves can be continuously bent along an arc-shaped trajectory by gradually tuning the filling ratio of PCs. We investigate the acoustic mirage effect through both plane wave expansion and finite-difference time-domain methods. By controlling the incident angle or operating frequency, the arc-shaped trajectory of acoustic wave propagation can be dynamically adjusted. The GRIN PC structure is composed of steel cylinders, positioned in a square lattice, and immersed in an epoxy. It can be fabricated through a simple process and seamlessly integrated with existing acoustic devices. In addition, we establish that such an acoustic effect can be used in the design of tunable acoustic waveguides, which could find applications in acoustic switching, filtering, and biosensing.