研究SH波分别从0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3(PMN-0.29PT)介质和金刚石介质倾斜入射时在双材料界面上的反射和透射规律。PMN-0.29PT单晶沿[011]c方向极化，宏观上呈正交各向异性性质，且材料主轴沿x3方向旋转切割，数值分析了SH波斜入射时在交界面处的反射、透射系数以及能量反射、透射系数随入射角的变化。结果显示：SH波从金刚石入射时，压电晶体的旋转切割角度对SH波的反射、透射系数和能量分配规律起到非常关键的作用；SH波从压电材料入射时，晶体的旋转切割角度越大，临界角越小，随着入射角的增大，切割角度对SH波反射系数的影响逐渐减小。这些结论可为PMN-PT单晶材料在传感器和频率控制等领域中的应用提供有价值的理论参考。
Abstract
Reflection and transmission of SH waves at a interface between 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3(PMN-0.29PT) and diamond is discussed. The PMN-0.29PT single crystal under consideration is poled along the [011]c direction so that the macroscopic symmetry is orthonormal mm2. The cut orientation make an angle with the XZ-plane. The reflection and transmission coefficients and energy distribution coefficients varying with the incident angle are analyzed for SH wave oblique incidence. Results show that the cut orientation is critical for the reflection and transmission coefficients and energy distribution coefficients for the SH wave incidence from elastic materials. When SH waves incident from piezoelectric media, the larger the cut angle, the smaller the corresponding critical angle, and the cut angle has little influence on the reflection and transmission coefficients for a given large incidence angle. The results are valid for signal processing, transduction, and frequency control of PMN-PT single crystal composites devices.
关键词
SH波 /
PMN-PT单晶 /
金刚石 /
反射系数 /
透射系数
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Key words
SH wave /
PMN-PT Single Crystals /
Diamond /
Reflection coefficients /
Transmission coefficients
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