Visualization of acoustic power flow in suspended thin-film lithium niobate phononic devices
Visualization of acoustic power flow in suspended thin-film lithium niobate phononic devices
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DOI：
10.1063/5.0073530
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发表时间：
2021-11-22
影响因子：
4
通讯作者：
Lai, Keji
中科院分区：
文献类型：
--
作者：
Lee, Daehun;Meyer, Shawn;Lai, Keji
我们报道了在铌酸锂声子电路中直接显示千兆赫兹频率的声波。利用透射式微波阻抗显微镜测量了功率流角和传播损耗等主要传播参数。利用快速傅里叶变换，我们可以分别分析前向和后向传播的波，并定量地评估传播损耗。我们的工作提供了关于压电薄膜的传播、衍射和衰减的有洞察力的信息，这对于设计和优化用于微波信号处理的声子器件是非常必要的。
We report direct visualization of gigahertz-frequency acoustic waves in lithium niobate phononic circuits. Primary propagation parameters, such as the power flow angle and propagation loss, are measured by transmission-mode microwave impedance microscopy. Using a fast Fourier transform, we can separately analyze forward and backward propagating waves and quantitatively evaluate the propagation loss. Our work provides insightful information on the propagation, diffraction, and attenuation in piezoelectric thin films, which is highly desirable for designing and optimizing phononic devices for microwave signal processing.