Development of Composite Nonlinear Optical Materials Based on Local Field Enhancement

基于局域场增强的复合非线性光学材料的研制

• 批准号: 9223726
• 负责人: Robert Boyd
• 金额: $ 23.95万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9223726&HistoricalAwards=false
• 关键词: Development; Composite; Nonlinear; Optical; Materials

9223726 Boyd We will perform experimental and theoretical work aimed at the development of new nonlinear optical materials with improved nonlinear response. The basic idea of our approach is to form a composite material of two (or more) constituents that differ both in their linear and nonlinear optical properties. The electric field of an applied optical wave will therefor be nonuniformly distributed between the two constituents, leading to an effective nonlinear susceptibility of the composite that can exceed that of either of its constituent materials. In our initial theoretical studies, we have discovered realistic conditions in which such a local-field enhancement can be at least a factor of five. In our approach, both constituents can be optically lossless, and thus our approach should be distinguished from recent work involving metal colloids and semiconductor-doped glasses in which the composite material is necessarily absorbing. Experiments to be performed as part of this investigation are aimed both at developing a fundamental understanding of the role of local field effects in determining the nonlinear optical properties of composite materials and at developing actual composite materials with improved nonlinear response. Our method is general in scope, that is, it is applicable to both second- and third-order nonlinear optical materials and it can be used to increase the nonlinear optical response of essentially any homogeneous optical material by forming a composite out of that material. However, our initial experimental studies will consider the enhancement in the nonlinear optical properties of polymeric optical materials. ***

9223726 Boyd我们将进行实验和理论工作，旨在开发具有改进非线性响应的新型非线性光学材料。我们的方法的基本思想是形成两种（或更多）成分的复合材料，这些成分在线性和非线性光学性质上都不同。因此，施加的光波的电场将不均匀地分布在两种成分之间，导致复合材料的有效非线性磁化率可以超过其组成材料中的任何一种。在我们最初的理论研究中，我们已经发现了这样的局部场增强至少可以达到5倍的现实条件。在我们的方法中，这两种成分都可以是光学无损的，因此我们的方法应该区别于最近涉及金属胶体和半导体掺杂玻璃的工作，其中复合材料必须吸收。作为本研究的一部分，将进行的实验旨在发展对局部场效应在确定复合材料非线性光学特性中的作用的基本理解，并开发具有改进非线性响应的实际复合材料。我们的方法是通用的，也就是说，它适用于二阶和三阶非线性光学材料，它可以用来增加非线性光学响应基本上任何均匀的光学材料，通过形成复合材料的材料。然而，我们的初步实验研究将考虑提高聚合物光学材料的非线性光学性能。＊＊＊