Impact of interface stiffness in surface-wave resonances on nano-strip-attached substrates
Impact of interface stiffness in surface-wave resonances on nano-strip-attached substrates
复制标题
表面波共振中界面刚度对纳米带附着基底的影响
DOI：
10.1103/physrevb.93.024112
复制
发表时间：
2016
影响因子：
3.7
通讯作者：
and T. Ono
中科院分区：
文献类型：
--
作者：
H. Ogi;S. Masuda;A. Nagakubo;N. Nakamura;M. Hirao;K. Kondou;and T. Ono
表面波通常是由附着在衬底上的许多纳米带组成的交指换能器激发的，人们已经认识到，附着的纳米带的质量和刚度在一定程度上影响表面波的共振。在这里，我们揭示了在高频下带材和衬底之间的界面刚度的更显著的影响。这种影响被皮秒超声光谱激发和检测高达GHz的表面波共振所证实。对于硅衬底，随着界面刚度的降低，共振频率显著降低，衰减显著增加。然而，SiO_2衬底的瑞利波-共振色散曲线上出现了低衰减分支，其共振频率与瑞利波的频率几乎相同。以前的模型无法再现这些表面波共振行为。所提出的包含界面刚度的理论模型一致地解释了它们，表明了界面结合强度在设计表面波谐振器中的重要性。
Surface waves are often excited by interdigitated transducers consisting of many nanostrips attached on a substrate, and it has been recognized that the mass and stiffness of the attached nanostrips affect surface-wave resonances to some extent. Here, we reveal the more noticeable influence of the interfacial stiffness between strips and substrate at high frequencies. This influence is confirmed by exciting and detecting surface-wave resonances up toGHz by picosecond ultrasound spectroscopy. The resonance frequency significantly decreases and attenuation increases as the interfacial stiffness decreases for silicon substrate. However, low-attenuation branches appear along the Rayleigh-wave-resonance dispersion curve for silica substrate, and the resonance frequencies remain nearly identical to those of the Rayleigh waves. Previous models fail to reproduce these surface-wave resonance behaviors. The proposed theoretical model, involving the interfacial stiffness, consistently explained them, indicating the importance of the interface bond strength in designing surface-wave resonators.