Low-frequency forbidden bandgap engineering via a cascade of multiple 1D superlattices
Low-frequency forbidden bandgap engineering via a cascade of multiple 1D superlattices
复制标题
通过级联多个一维超晶格进行低频禁带隙工程
DOI：
10.1063/1.5049514
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
Wenwu Cao
中科院分区：
文献类型：
--
作者：
Sai Zhang;Yan Zhang;Wei Lu;Guanghua Hu;Bai-qiang Xu;Wenwu Cao
Low-frequency forbidden bandgap (LFB) in solid-fluid superlattice (SFSL) provides a novel degree of freedom to control the propagation of low frequency acoustic waves. However, its narrow angle range seriously restricts its practical applications. To engineer the angle range of LFB, the transmission coefficient of a cascade of multiple 1D superlattices was calculated using the transfer matrix method and also verified by finite element simulations. It was found that the LFB with ultra-wide angle range can be created using only 4 cells of a two-phased cascade structure and can be adjusted by changing the solid filling fraction of each sub-SFSL. By introducing two or more 1D superlattices into the layered cascade structure, the LFB with multiple angle ranges and/or ultra-wide angle range can be engineered for low frequency acoustic waves whose wavelengths are much larger than the lattice constant. Such acoustic low-frequency forbidden bandgap materials are useful for making perfect acoustic low-frequency filters with broad bandwidth in selective angle ranges, which are useful in subwavelength acoustic devices.Low-frequency forbidden bandgap (LFB) in solid-fluid superlattice (SFSL) provides a novel degree of freedom to control the propagation of low frequency acoustic waves. However, its narrow angle range seriously restricts its practical applications. To engineer the angle range of LFB, the transmission coefficient of a cascade of multiple 1D superlattices was calculated using the transfer matrix method and also verified by finite element simulations. It was found that the LFB with ultra-wide angle range can be created using only 4 cells of a two-phased cascade structure and can be adjusted by changing the solid filling fraction of each sub-SFSL. By introducing two or more 1D superlattices into the layered cascade structure, the LFB with multiple angle ranges and/or ultra-wide angle range can be engineered for low frequency acoustic waves whose wavelengths are much larger than the lattice constant. Such acoustic low-frequency forbidden bandgap materials are useful for making perfect acoustic low-frequency fil...
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二维声子晶体中通带频率下的声定向辐射
DOI：
10.1088/0022-3727/42/11/115417
发表时间：
2009-06
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
通讯作者：
--
影响因子：
64.8
作者：
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通讯作者：
Lerosey, Geoffroy
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影响因子：
3.2
作者：
Zhang Sai;Xu Bai qiang;Cao Wenwu
通讯作者：
Cao Wenwu
影响因子：
3.2
作者：
Ying Wu;Min Yang;P. Sheng
通讯作者：
Ying Wu;Min Yang;P. Sheng
影响因子：
8.6
作者：
KUSHWAHA, MS;HALEVI, P;DJAFARIROUHANI, B
通讯作者：
DJAFARIROUHANI, B