通过超分子手性实现非线性光学性质的强烈增强。

Strong enhancement of nonlinear optical properties through supramolecular chirality.

作者信息

Verbiest T, Elshocht SV, Kauranen M, Hellemans L, Snauwaert J, Nuckolls C, Katz TJ, Persoons A

机构信息

T. Verbiest, S. Van Elshocht, M. Kauranen, L. Hellemans, J. Snauwaert, A. Persoons, Laboratory of Chemical and Biological Dynamics, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Heverlee, Belgium. C. Nuckolls and T. J.

出版信息

Science. 1998 Oct 30;282(5390):913-5. doi: 10.1126/science.282.5390.913.

DOI:10.1126/science.282.5390.913

PMID:9794754

Abstract

A new approach to second-order nonlinear optical (NLO) materials is reported, in which chirality and supramolecular organization play key roles. Langmuir-Blodgett films of a chiral helicene are composed of supramolecular arrays of the molecules. The chiral supramolecular organization makes the second-order NLO susceptibility about 30 times larger for the nonracemic material than for the racemic material with the same chemical structure. The susceptibility of the nonracemic films is a respectable 50 picometers per volt, even though the helicene structure lacks features commonly associated with high nonlinearity. Susceptibility components that are allowed only by chirality dominate the second-order NLO response.

摘要

报道了一种用于二阶非线性光学（NLO）材料的新方法，其中手性和超分子组织起着关键作用。手性螺旋烯的朗缪尔-布洛杰特膜由分子的超分子阵列组成。手性超分子组织使得非外消旋材料的二阶NLO极化率比具有相同化学结构的外消旋材料大30倍左右。即使螺旋烯结构缺乏通常与高非线性相关的特征，非外消旋膜的极化率仍达到可观的每伏50皮米。仅由手性允许的极化率分量主导二阶NLO响应。