论文标题
在紧密间隔的压电晶体之间的声波的完整隧道
Complete tunneling of acoustic waves between closely spaced piezoelectric crystals
论文作者
论文摘要
当将两个压电固体近距离放置时，声波（声子）可以在真空间隙之间“隧道”在两个固体之间传输能量。在这里，我们从分析上证明，不仅可能是一种现象，而且存在一种简单的共振条件，可以使传入波的完全传播是可能的，而且物理上与泄漏的表面波的激发相对应。该结果是针对任意各向异性晶体对称性和方向得出的。我们还表明，完整的传输条件可能与压电材料的表面电阻抗和有效的表面介电常数有关，从而可以通过实验确定。此外，我们还提出了慢速横向波的最大功率透射率，同一ZnO晶体之间的隧穿，这是所有可能的晶体方向的函数。结果表明，可以实现完整的隧道范围的各种方向。
When two piezoelectric solids are placed in close proximity, acoustic waves (phonons) can "tunnel" across a vacuum gap transmitting energy between the two solids. Here, we demonstrate analytically that not only is such a phenomenon possible, but that a simple resonance condition exists for which complete transmission of the incoming wave is possible, physically corresponding to the excitation of leaky surface waves. This result is derived for an arbitrary anisotropic crystal symmetry and orientation. We also show that the complete transmission condition can be related to the surface electric impedance and the effective surface permittivity of the piezoelectric material, making it possible to be determined experimentally. In addition, we present numerical results for the maximum power transmittance of a slow transverse wave, tunneling between identical ZnO crystals, as function of all possible crystal orientations. The results show a large range of orientations for which complete tunneling can be achieved.
