Supramolecular Self-Assembly of Second Order Nonlinear Optical Materials for Electro-Optic Devices

用于电光器件的二阶非线性光学材料的超分子自组装

• 批准号: 9907747
• 负责人: James Heflin
• 金额: $ 25万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907747&HistoricalAwards=false
• 关键词: Supramolecular; Self; Assembly; Second; Order

This proposal describes a program aimed at the realization of large second-order nonlinear optical coefficients in polymer thin films that exhibit high thermal, mechanical, and chemical stability. It can be achieved by controlling the molecular orientation of active chromphores into noncentrosymmetric assemblies at nanoscale levels. Specifically, the approach is to design and fabricate the organic thin films by using unique self assembly of multilayers in which alternative subnanometer thick layers of oppositely charged anions and cations are built by alternately dipping a solid substrate into solutions of oppositely charged polyelectrolytes. In preliminary studies the group has grown films consisting of 100 such bilayers. These films are robust, and no degradation of the second order nonlinearity was observed over two years under ambient temperature and more than 18 hours at 150oC. However, further investigation showed that the net orientation of the chromophores was only 2%. The aim of this proposed research is to improve the degree of orientation by using the novel molecular self-assembly concept and by using surface angle and optical measurements to determine the degree of orientation.

该提案描述了一个旨在实现具有高的热，机械和化学稳定性的聚合物薄膜中的大的二阶非线性光学系数的程序。它可以通过在纳米尺度上控制活性发色团的分子取向形成非中心对称的组装体来实现。 具体地说，该方法是设计和制造的有机薄膜，通过使用独特的自组装多层膜，其中交替亚纳米厚层的带相反电荷的阴离子和阳离子是通过交替浸渍到溶液中的带相反电荷的聚电解质的固体基板建立。 在初步研究中，该小组已经生长出了由100个这样的双层组成的薄膜。这些薄膜是坚固的，并且在环境温度下两年以上和在150 ℃下超过18小时没有观察到二阶非线性的退化。 然而，进一步的研究表明，发色团的净取向仅为2%。 本研究的目的是通过使用新的分子自组装概念，并通过使用表面角和光学测量来确定取向度，以提高取向度。