SGER: Acoustic Memory in LiNbo3 and Domian Structures

SGER：LiNbo3 和 Domian 结构中的声学记忆

• 批准号: 0531620
• 负责人: Mool Gupta
• 金额: $ 1.55万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-01 至 2005-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0531620&HistoricalAwards=false
• 关键词: SGER; Acoustic; Memory; LiNbo3; Domian

A research program to enhance the scientific knowledge and control of acoustic wave propagation in periodically poled ferroelectric domains is proposed. These authors speculated that the acoustic memory effect might be tied to the pinning and relaxation of ferroelectric domain walls within the crystal. The physical model is definitely very speculative at this point and requires experimental verification. The objective of this proposed research is to verify the pinning and relaxation of domain walls as a source of acoustic memory observed in LiNbO3. Another objective is to develop a basic understanding of the role of domain walls on acoustic wave propagation, reflection and nonlinear effects. Also, acoustic wave detection may provide a sensitive nondestructive method for imaging of ferroelectric domains.The application of ferroelectric crystals like LiNbO3 and LiTaO3 with periodic domain structures gives the possibility of realizing a new class of acoustoelectronic devices such as SAW transducers, filters, delay lines, frequency standards and analog signal processing. Because of the large optic nonlinearities, the crystals can be used in devices such as electro-optic modulators, parametric oscillators, and harmonic generators. Also, the piezoelectric properties allow application in the accelerometers, x-y positioners, ultrasonic cleaners, gas sensors, and ultrasonic wire bonders.In addition to advancing the development of the science, engineering, andmanufacturing technology in ferroelectric materials, the proposed research will find applications in educational activity such as in the development of a course on optoelectronic materials, devices and applications as well as practical applications.

提出了一项研究计划，以增强周期性极化铁电域中声波传播的科学知识和控制。这些作者推测，声记忆效应可能与晶体内铁电畴壁的钉扎和弛豫有关。物理模型在这一点上肯定是非常推测性的，需要实验验证。这项研究的目的是验证畴壁的钉扎和弛豫作为 LiNbO3 中观察到的声学记忆的来源。另一个目标是对畴壁对声波传播、反射和非线性效应的作用有一个基本的了解。此外，声波检测可以为铁电域成像提供一种灵敏的无损方法。具有周期性域结构的铁电晶体（例如LiNbO3和LiTaO3）的应用为实现新型声电子器件（例如SAW换能器、滤波器、延迟线）提供了可能。 、频率标准和模拟信号处理。由于具有较大的光学非线性，该晶体可用于电光调制器、参量振荡器和谐波发生器等设备。此外，压电特性还可以应用于加速计、x-y定位器、超声波清洁器、气体传感器和超声波焊线机。除了推动铁电材料科学、工程和制造技术的发展外，拟议的研究还将在以下领域找到应用：教育活动，例如开发光电材料、器件和应用以及实际应用课程。