Controlling the angle range in acoustic low-frequency forbidden transmission in solid-fluid superlattice
Controlling the angle range in acoustic low-frequency forbidden transmission in solid-fluid superlattice
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固液超晶格中声学低频禁止传输的角度范围控制
DOI：
10.1063/1.5023516
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发表时间：
2018-03
影响因子：
3.2
通讯作者：
Cao Wenwu
中科院分区：
文献类型：
--
作者：
Zhang Sai;Xu Bai qiang;Cao Wenwu
我们研究了固-流超晶格(SFSL)中频率低于第一布拉格带隙的声波的低频禁带传输(LFT)。当声平面波在一定角度范围内撞击单边带界面时，形成LFT。然而，对于由金属材料和水组成的SFSL，LFT的角度范围非常窄，这限制了它的实际应用。本文用控制变量法对角度范围的变化特征进行了综合研究。结果表明，材料的填充比、层数、波速和质量密度对夹角范围有显著影响。基于我们的结果，提出了一种获得大角度LFT的有效策略，这将有助于LFT在各种器件中的潜在应用，如低频滤波器和亚波长单向二极管。
We have investigated low-frequency forbidden transmission (LFT) of acoustic waves with frequency lower than the first Bragg bandgap in a solid-fluid superlattice (SFSL). LFT is formed when the acoustic planar wave impinges on the interface of a SFSL within a certain angle range. However, for the SFSL comprised of metallic material and water, the angle range of LFT is extremely narrow, which restricts its practical applications. The variation characteristics of the angle range have been comprehensively studied here by the control variable method. The results suggest that the filling ratio, layer number, wave velocity, and mass density of the constituent materials have a significant impact on the angle range. Based on our results, an effective strategy for obtaining LFT with a broad angle range is provided, which will be useful for potential applications of LFT in various devices, such as low frequency filters and subwavelength one-way diodes.
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