Tunability of acoustic spectral gaps and transmission in periodically stubbed waveguides

被引:35
作者
Wang, XF
Kushwaha, MS
Vasilopoulos, P
机构
[1] Concordia Univ, Dept Phys, Montreal, PQ H3G 1M8, Canada
[2] Univ Puebla, Inst Phys, Puebla 72570, Mexico
关键词
D O I
10.1103/PhysRevB.65.035107
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theoretical investigation is made of acoustic wave propagation in a periodically stubbed waveguide. In general the waveguide segments and stubs are made of different materials, The acoustic wave in such a system has two independent polarizations: out-of-plane and in-plane modes. The band structure and transmission spectrum is studied for diverse geometries using a simple and efficient version of the transfer-matrix method. For the same material between the waveguide and symmetric stubs the width of some gaps can change, upon varying the stub length or width, by more than one order of magnitude. A further modulation can be achieved for different material between the stubs and the main waveguide or if the stubs are asymmetric. The gaps in the band structure of an infinitely long system correspond to those in the transmission spectrum of the same system but with finite number it of units. For n finite (i) there exist pseudogaps that gradually turn into complete gaps with increasing n and (ii) the introduction of defects gives rise to states in the gaps and leads to transmission resonances.
引用
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页码:1 / 10
页数:10
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