Parametric Amplification with Surface Acoustic Waves
Parametric Amplification with Surface Acoustic Waves
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表面声波参数放大
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Ting Lu
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文献类型：
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作者：
Ting Lu
作者：Lu，Ting|顾问：王元勋|摘要：本论文的主要工作是利用声波平台，通过时空参量调制来研究时间反演对称破缺，以开发放大器和混频器等非线性器件。声波平台的优点在于它可以利用射频声波的低速和小波长获得很大的杠杆作用，以最大限度地减少传输线的占地面积。利用非线性声表面波（Surface Acoustic Wave，SAW）光栅在压电材料中泵浦动态偏置电场，使泵浦电磁波与传播的声表面波在相位匹配的条件下耦合，实现参量放大。提出了两种不同的方法来实现压电系数和弹性刚度的非线性变化：1）使用铁磁材料如BST的材料非线性; 2）使用垂直和平行刚度之间的耦合的几何非线性。在第一种方法中，弹性刚度的分数调制约为4%，而在第二种方法中可以达到10%甚至更高。利用COMSOL仿真验证了声表面波器件的参数固定效应。本文还介绍了声表面波延迟线的制作和表征。
Author(s): Lu, Ting | Advisor(s): Wang, Yuanxun | Abstract: This work is to explore the time-reversal symmetry breaking employing an acoustic wave platform through space-time parametric modulations, for the purpose of developing nonlinear devices such as amplifiers and mixers. The strength of acoustic wave platform is that it can obtain great leverage on the slow velocity and small wavelength of acoustic waves at RF to minimize the footprint of transmission lines. To realize parametric amplification, nonlinear Surface Acoustic Wave(SAW) grating is employed to pump a dynamic biasing electric field into the piezoelectric material to couple the pump electromagnetic wave to the propagating surface acoustic waves in the condition of phase matched. Two different ways to achieve nonlinear change of piezoelectric coefficient and elastic stiffness are proposed: 1) Material nonlinearity using ferromagnetic material like BST; 2) Geometrical nonlinearity using the coupling between vertical and parallel stiffness. The fractional modulation of elastic stiffness is approximate 4% in the first approach and can reach 10% or even higher in the second approach. Simulation validation using COMSOL demonstrates the parametric fixing effects produced on the Surface Acoustic Wave devices. Fabrication and characterization of Surface Acoustic Wave delay lines are also provided.