RUI: Phase Stability and Chromophore Reorientation in Photorefractive Polymer Composites

RUI：光折变聚合物复合材料中的相稳定性和发色团重新取向

• 批准号: 0103817
• 负责人: David McGee
• 金额: $ 13.39万
• 依托单位: Drew University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0103817&HistoricalAwards=false
• 关键词: RUI; Phase; Stability; Chromophore; Reorientation

This RUI project addresses photo-refractive macromolecular materials research with emphasis on the synthesis and characterization of new chromophores with appropriate non-linear optical response, and seeks to identify the relationship between phase stability and chromophore reorientation in low-Tg (glass transition temperature) photorefractive polymers. Photorefractive polymers blended with nonlinear optical dye molecules exhibit relatively large refractive index modulations due to spatial reorientation of the dye. An interdisciplinary team of Drew University students and faculty from the Chemistry and Physics departments will fabricate photorefractive polymers spanning a range of materials behavior by synthesizing dye molecules of relatively similar optical properties but considerably different interactions with the host polymer. The phase stability of each composite will be observed through measurements of the time dependent optical absorption coefficient. The refractive index modulation will be determined by diffraction efficiency measurements, and the relative orientational mobility of the dyes will be inferred through frequency dependent transmission ellipsometry. This data will be used to delineate boundaries of the phase-stability/orientational-mobility tradeoff, and to improve understanding of dye-polymer interactions and the design of blends suitable for applications.%%% An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. All of the materials fabrication and optical characterization will occur at Drew University in chemistry and laser laboratories. These laboratories have been developed in part through an NSF-ILI grant "Materials science and nonlinear optics in physics and chemistry laboratories" and represent an ongoing effort to integrate the fabrication and characterization of nonlinear optical materials with Drew undergraduate instructional labs. The experiments are tabletop in scale and expose students to the photonic and electronic technology valued by employers and graduate schools. Students will also have the opportunity to study the holographic image storage properties of the materials they fabricate through a collaboration between the principal investigator and Dr. G. Wood of the Army Research Lab. The research is intellectually accessible to undergraduates, giving them a sense of ownership in their work. This RUI award will support six summer research students over three years, and will provide equipment support for Honors and Independent Study projects during the academic year. Results will be disseminated in peer-reviewed research literature with student co-authors and presented at professional meetings. ***

RUI项目致力于光折变高分子材料的研究，重点是具有适当非线性光学响应的新生色团的合成和表征，并试图确定低Tg(玻璃化转变温度)光折变聚合物中相稳定性和生色团重新取向之间的关系。与非线性光学染料分子共混的光折变聚合物由于染料的空间取向改变而表现出相对较大的折射率调制。一个由德鲁大学学生和化学和物理系教员组成的跨学科团队将通过合成光学性质相对相似但与宿主聚合物相互作用大不相同的染料分子来制造跨越一系列材料行为的光折变聚合物。通过测量随时间变化的光吸收系数来观察每种复合材料的相稳定性。折射率调制将通过测量衍射效率来确定，而染料的相对取向迁移率将通过频率依赖的透射式椭圆偏振法来推断。这些数据将被用来描述相稳定性/取向-迁移率权衡的边界，并提高对染料-聚合物相互作用的理解，以及适合应用的共混物的设计。%该计划的一个重要特点是通过培训学生在一个基础和技术上具有重要意义的领域来整合研究和教育。所有的材料制造和光学表征都将在德鲁大学的化学和激光实验室进行。这些实验室在一定程度上是通过NSF-ILI授予的“物理和化学实验室中的材料科学和非线性光学”资助发展起来的，代表着将非线性光学材料的制造和表征与DREW本科教学实验室相结合的持续努力。这些实验是桌面规模的，让学生接触到雇主和研究生院重视的光子和电子技术。学生们还将有机会通过首席研究员和陆军研究实验室的G.Wood博士的合作，学习他们制造的材料的全息图像存储特性。这项研究对本科生来说是智力上的，让他们对自己的工作有一种主人翁意识。该奖项将在三年内资助六名暑期研究生，并将在学年期间为荣誉和自主学习项目提供设备支持。结果将与学生合著者一起在同行评议的研究文献中传播，并在专业会议上公布。***