[论文解读] Suppressing Acoustomigration and Temperature Rise for High-power Robust Acoustics

Fangsheng Qian, Shuhan Chen+7 more|arXiv (Cornell University)|Mar 11, 2026

Acoustic Wave Resonator Technologies被引用 0

一句话总结

本文提出一种分层声波（LAW）平台，采用厚单材料上覆层以抑制声迁移和发热，从而实现高功率、GHz范围的SAW器件，并提升热与机械鲁棒性。

ABSTRACT

High-frequency acoustic wave transducers, vibrating at gigahertz (GHz), favored for their compact size, are not only dominating the front-end of mobile handsets but are also expanding into various interdisciplinary fields, including quantum acoustics, acoustic-optics, acoustic-fluids, acoustoelectric, and sustainable power conversion systems. However, like strong vibration can "shake off" substances and produce heat, a long-standing bottleneck has been the ability to harness acoustics under high-power vibration loads, while simultaneously suppressing temperature rise, especially for IDT-based surface acoustic wave (SAW) systems. Here, we proposed a layered acoustic wave (LAW) platform, utilizing a quasi-infinite multifunctional top layer, that redefines mechanical and thermal boundary conditions to overcome three fundamental challenges in high-power acoustic wave vibration: self-heating, thermal instability, and acoustomigration. By simply leveraging a simplified, thick single-material overlayer to achieve electro-thermo-mechanical co-design, this acoustic platform moves beyond prior substrate-focused thermal management in SAW technology. It demonstrates, for the first time from the top boundary, simultaneous redistribution of the von Mises stress field and the creation of an efficient vertical thermal dissipation path. The LAW transducer, vibrating at over 2 GHz, achieves a 70% reduction in temperature rise under identical power loads, a first-order temperature coefficient of frequency (TCF) of -13 ppm/C with minimal dispersion, and an unprecedented threshold power density of 45.61 dBm/mm2 - over one order-of-magnitude higher than that of state-of-the-art thin-film surface acoustic wave (TF-SAW) counterparts at the same wavelength.

研究动机与目标

• 解决高功率 GHz 声波器件的自发热、热不稳定性与声迁移问题。
• 开发一个顶层边界设计，以重新分配应力并提供高效的垂直热耗散。
• 利用厚的单材料上覆层实现电-热-机械协同设计，以提高基于IDT的SAW系统的鲁棒性。
• 实现应力重新分布与顶边界的增强冷却的同时作用。

提出的方法

• 提出具有准无限多功能顶层的分层声波（LAW）平台。
• 利用厚的单材料上覆层实现电-热-机械协同设计。
• 重新分布冯-迈斯应力场并从顶边界创造垂直热耗散路径。
• 在功率超过2 GHz 的高功率工作条件下实现更好的热管理。

实验结果

研究问题

• RQ1 顶层仅设计能否在高功率下抑制声迁移，同时保持或降低器件温升？
• RQ2 厚的单材料上覆层是否能在 GHz SAW 设备中实现有效的热耗散与应力重新分布？
• RQ3 在 LAW 平台下，高功率负载下可实现的温升降低与频率稳定性（TCF）是多少？

主要发现

• LAW 捏合器在超2 GHz 工作.
• 在相同功率负载下，温升降低了 70%。
• 一阶温度系数（TCF）为 -13 ppm/°C，色散最小。
• 阈值功率密度达到 45.61 dBm/mm2，远高于同等波长下的最先进 TF-SAW。