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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2006.15829physics.app-ph
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高声学指数对比声子电路的数值模拟

High-acoustic-index-contrast phononic circuits: numerical modeling

Wance Wang, Mohan Shen, Chang-Ling Zou, Wei Fu, Zhen Shen, Hong X. Tang

摘要:

我们数值模拟的声子集成电路,使声子路由在高声学指数波导的关键组成部分。我们特别关注的是蓝宝石上氮化镓声子平台,该平台最近在不使用悬挂结构的情况下在其顶层表现出高声学限制。我们首先系统地模拟了各种横声子模式支持在条形波导和环形谐振腔与亚波长截面。数值研究了声子模的模式限制和品质因数随几何参数的变化。在优化的环形谐振器的品质因数高达$10^{8}$的预测。接下来,我们研究的声子定向耦合器的设计,并提出关键的设计参数,以实现强大的倏逝波之间的耦合在平行波导中传播的模式。最后,交叉指型换能器电极包括在模拟直接激励的环形谐振器和微波输入和声子耗散之间的临界耦合。我们的工作提供了全面的数值表征的声子模式和功能声子元件在高声学指数声子电路,补充了以前的理论,并有助于新兴领域的声子集成电路。

英文摘要:

We numerically model key building blocks of a phononic integrated circuit that enable phonon routing in high-acoustic-index waveguides. Our particular focus is on Gallium Nitride-on-sapphire phononic platform which has recently demonstrated high acoustic confinement in its top layer without the use of suspended structures. We start with systematic simulation of various transverse phonon modes supported in strip waveguides and ring resonators with sub-wavelength cross-section. Mode confinement and quality factors of phonon modes are numerically investigated with respect to geometric parameters. Quality factor up to $10^{8}$ is predicted in optimized ring resonators. We next study the design of the phononic directional couplers, and present key design parameters for achieving strong evanescent couplings between modes propagating in parallel waveguides. Last, interdigitated transducer electrodes are included in the simulation for direct excitation of a ring resonator and critical coupling between microwave input and phononic dissipation. Our work provides comprehensive numerical characterization of phonon modes and functional phononic components in high-acoustic-index phononic circuits, which supplements previous theories and contributes to the emerging field of phononic integrated circuits.

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