Phononic crystals with planar defects
Phononic crystals with planar defects
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DOI：
10.1103/physrevb.62.5536
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发表时间：
2000-09-01
影响因子：
3.7
通讯作者：
Modinos, A
中科院分区：
文献类型：
--
作者：
Psarobas, IE;Stefanou, N;Modinos, A
本文研究了球形散射体声子晶体中的平面缺陷效应。它示出，一个平面的杂质球引入振动模式的弹性场定位在这个平面上的频率范围内的频率gag的purl声子晶体：这些显示为尖锐的共振的透射率的弹性波入射在平板上的晶体。杂质平面沿给定方向沿着的周期性排列产生窄杂质带，其宽度取决于这些带在纯晶体的频率eap内的位置和杂质平面之间的间隔。我们展示了如何轻微偏离周期性（一个杂质平面是不同的，从休息）显着降低了透射率的弹性波入射在平板上的晶体。
We study the effect of planar defects in phononic crystals of spherical scatterers. It is shown that a plane of impurity spheres introduces modes of vibration of the elastic field localized on this plane at frequencies within a frequency gag of a purl phononic crystal: these show up as sharp resonances in the transmittance of elastic waves Incident on a slab of the crystal. A periodic arrangement of impurity planes along a given direction creates narrow impurity bands with a width which depends on the position of these bands within the frequency eap of the pure crystal and on the separation between the impurity planes. We show how a slight deviation from periodicity (one impurity plane is different from the rest) reduces dramatically the transmittance of elastic waves incident on a slab of the crystal.