Institut d’Electronique, de Microelectronique, et de Nanotechnologie, Lille, France.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Jan;58(1):178-86. doi: 10.1109/TUFFC.2011.1784.
A two-dimensional phononic crystal (PC) made of a square lattice of air holes in an aluminum matrix is studied. The band structure calculated in the irreducible Brillouin zone of the PC exhibits a branch with a negative slope that allows negative refraction. This phenomenon has been numerically verified using a prism-shaped PC for plane waves entering the PC with two different incidences. A detailed study of the waves at the exit of the PC shows that the plane wave is reconstructed after several wavelengths. Finally, the description of the refracted waves is interpreted using a point source array, giving information about the angular spreading and the relative amplitude of each refracted beam.
研究了一种由铝基质中的空气孔正方形晶格构成的二维声子晶体（PC）。在 PC 的不可约布里渊区中计算出的能带结构显示出具有负斜率的分支，允许负折射。这一现象已经通过使用具有两个不同入射角的平面波进入 PC 的棱镜形 PC 进行了数值验证。对 PC 出口处的波的详细研究表明，在经过几个波长后，平面波被重建。最后，使用点源阵列对折射波进行描述，提供有关每个折射光束的角度扩展和相对幅度的信息。
