CAREER: Real Time Studies of Domain Dynamics in Ferroelectrics for Photonic Applications

职业：光子应用铁电体域动力学的实时研究

• 批准号: 9984691
• 负责人: Venkatraman Gopalan
• 金额: $ 30.32万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9984691&HistoricalAwards=false
• 关键词: CAREER; Real; Time; Studies; Domain

This CAREER project focuses on ferroelectric lithium niobate (LiNbO3 ) and lithium tantalate (LiTaO3 ) relevant to integrated and nonlinear optics. The approach is to directly probe the structure and dynamics of ferroelectric domains in LiNbO3 and LiTaO3 by real-time, in-situ, and nondestructive probes. The proposed studies seek new information and understanding in the areas of (1) Real-time tracking of the motion of individual domain walls under electric fields in single crystals on nano-to-millisecond time scales by Electro-Optic Imaging Microscopy. (2) In-situ probing of the evolution of domain statistics in thin films with electric field and temperature by Second harmonic Generation measurements. (3) Probing domain wall pinning, bending and depinning processes on submicroscopic length scales using Near-Field Scanning Optical Microscopy (NSOM) and Scanning Force Microscopy (SFM). Fundamental insights into the classical problems of domain wall structure, wall mobilities, merger dynamics, and pinning-depinning interactions between a domain wall and lattice defects are sought, and will be utilized to achieve more effective techniques to shape and control ferroelectric domains. %%%The project addresses fundamental research issues in a topical area of materials science having high technological relevance. The research will contribute basic materials science, physics, and engineering knowledge at a fundamental level to important aspects of electronic/photonic materials and advanced devices/circuits. The scope of the project will expose students to challenges in materials synthesis, processing, and characterization. An important feature of the project is the strong emphasis on education, and on the integration of research and education.***

该职业项目重点关注与集成和非线性光学相关的铁电铌酸锂 (LiNbO3 ) 和钽酸锂 (LiTaO3 )。 该方法是通过实时、原位、无损探针直接探测LiNbO3和LiTaO3中铁电畴的结构和动力学。拟议的研究寻求以下领域的新信息和理解：（1）通过电光成像显微镜在纳秒至毫秒时间尺度上实时跟踪单晶电场下各个畴壁的运动。 (2) 通过二次谐波产生测量，原位探测薄膜中电场和温度域统计演化的演化。 (3) 使用近场扫描光学显微镜 (NSOM) 和扫描力显微镜 (SFM) 在亚显微长度尺度​​上探测畴壁钉扎、弯曲和脱钉过程。 寻求对磁畴壁结构、壁迁移率、合并动力学以及磁畴壁与晶格缺陷之间的钉扎-脱钉相互作用等经典问题的基本见解，并将用于实现更有效的技术来塑造和控制铁电域。 %%%该项目解决了具有高度技术相关性的材料科学主题领域的基础研究问题。该研究将从根本上为电子/光子材料和先进器件/电路的重要方面贡献基础材料科学、物理学和工程知识。该项目的范围将使学生面临材料合成、加工和表征方面的挑战。该项目的一个重要特点是高度重视教育以及研究与教育的结合。***