journal6 ›› 2010, Vol. 31 ›› Issue (6): 56-59.

• 物理与电子 • 上一篇    下一篇

密度对声子晶体带隙的影响

  

  1. (吉首大学物理科学与信息工程学院,湖南 吉首 416000)
  • 出版日期:2010-11-25 发布日期:2012-04-11
  • 作者简介:颜琳(1973-),女,湖南娄底人,吉首大学物理科学与信息工程学院副教授,硕士,主要从事凝聚态物理、材料物理研究.
  • 基金资助:

    湖南省教育厅科学研究项目(09C787)

Influence of Density on Bandgap of Phononic Crystal

  1. (College of Physics Science and Information Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2010-11-25 Published:2012-04-11

摘要:从弹性波动方程出发,利用平面波展开法计算二维(三维)声子晶体的带结构,研究散射体与基体的密度比对最低带隙的影响,得出了最低带隙宽度和带隙边界随密度比的变化规律.数值计算结果显示随着密度比的增加,带隙下边界的频率降低,而上边界的频率升高,从而增加带隙宽度,且带隙能级不变.

关键词: 声子晶体, 平面波展开法, 带隙, 密度比

Abstract: Starting from elastic wave equation,plane wave expansion method is used to calculate the band structure of two-dimensional(three-dimensional) phononic crystals.The dependence of the lowest bandgap on the density ratio of scatterer to host is discussed.The authors obtain the variation principle of the bandgap’s width and bandgap’s boundary with the variety of the density ratio.Numerical results show that the frequency of the bandgap’s lower boundary becomes small,while the upper boundary becomes big as the density ratio increases.So the width of the lowest bandgap increases,and energy level of the lowest bandgap is invariable.

Key words: phononic crystal, plane wave expansion method, bandgap, density ratio

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