The effect of interface modulation on phononic band gaps for longitudinal modes in semiconductor superlattices
The effect of interface modulation on phononic band gaps for longitudinal modes in semiconductor superlattices
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DOI：
10.1063/1.4720467
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发表时间：
2012-05
影响因子：
3.2
通讯作者：
P. Nowak;M. Krawczyk
中科院分区：
文献类型：
--
作者：
P. Nowak;M. Krawczyk
本文从理论上研究了周期性界面调制对一维声子晶体纵振动模的影响。基于平面波法和时域有限差分法的计算结果表明，通过调节引入的调制，可以独立地控制第一声子带隙的底部和顶部。调制层的有效声阻抗被证明是非常重要的声子能隙的开放。纵向模式的带隙可以预期会出现在一个大范围的界面不均匀性。调制的形状被证明对所研究的性质没有任何显著影响。
We present the results of our theoretical investigation of the effect of a periodic interface modulation on the longitudinal vibrational modes in one-dimensional phononic crystals. Based on the plane wave method and the finite difference time domain method, our calculations show that the bottom and top of the first phononic gap can be controlled independently by adjusting the modulation introduced. The effective acoustic impedance of the modulated layers is demonstrated to be of key importance for the opening of phononic energy gaps. Band gaps for longitudinal modes can be expected to occur in a large range of interface inhomogeneity. The shape of the modulation proves not to have any significant effect on the investigated properties.