Optimization of the Spatial Configuration of Local Defects in Phononic Crystals for High Q Cavity
Optimization of the Spatial Configuration of Local Defects in Phononic Crystals for High Q Cavity
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DOI：
10.3389/fmech.2020.592787
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
D. Reyes;D. Martinez;M. Mayorga;Hyeonu Heo;E. Walker;A. Neogi
中科院分区：
文献类型：
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作者：
D. Reyes;D. Martinez;M. Mayorga;Hyeonu Heo;E. Walker;A. Neogi
可以在二维周期晶格内引入缺陷以在超声频率范围内实现声子腔或声子晶体（PnC）波导。这些缺陷在PnC晶格内的排列导致腔或波导的Q因子的修改。在这项工作中，使用圆柱形不锈钢散射体在水中形成的PnC内的空腔缺陷已被修改，以控制通过缺陷通道实现的声波导的传播和Q因子。PnC内的基于缺陷通道的波导沿着声波传播方向水平、垂直和沿着对角配置。数值模拟实验表明，基于缺陷的波导的Q因子提高了15倍以上的对角配置相比，水平配置。它还由于散射体半径的增加而增加，散射体半径从0.7 mm变化到0.95 mm。
Defects can be introduced within a 2-D periodic lattice to realize phononic cavities or phononic crystal (PnC) waveguides at the ultrasonic frequency range. The arrangement of these defects within a PnC lattice results in the modification of the Q factor of the cavity or the waveguide. In this work, cavity defects within a PnC formed using cylindrical stainless steel scatterers in water have been modified to control the propagation and Q factor of acoustic waveguides realized through defect channels. The defect channel–based waveguides within the PnC were configured horizontally, vertically, and diagonally along the direction of the propagation of the acoustic waves. Numerical simulations supported by experimental demonstration indicate that the defect-based waveguide’s Q factor is improved by over 15 times for the diagonal configuration compared to the horizontal configuration. It also increases due to an increase in the scatterers’ radius, which was varied from 0.7 to 0.95 mm.