2ND HARMONIC-GENERATION BY MEROCYANINE IN MESOMORPHIC FILMS - AN ANOMALOUS ELECTROSTATIC-FIELD EFFECT

被引：23

作者：

YITZCHAIK, S ^{[1
]}

BERKOVIC, G ^{[1
]}

KRONGAUZ, V ^{[1
]}

机构：

[1] WEIZMANN INST SCI,DEPT STRUCT CHEM,IL-76100 REHOVOT,ISRAEL

来源：

CHEMISTRY OF MATERIALS | 1990年 / 2卷 / 02期

关键词：

D O I：

10.1021/cm00008a017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Poled thin films of merocyanine obtained by photo- or thermochromic conversion of spiropyran incorporated in various mesogenic molecules, including liquid-crystal polymers, quasi-liquid crystals, and blends, exhibit strong second harmonic generation (SHG). As well as the “conventional” SHG deriving from the χ(2)xxx component, where x is the poling direction (in the plane of the film), the films exhibit an even stronger anomalous “perpendicular” SHG via χ(2)zzz hyperpolarizability when an electric field in the x direction is reapplied to the samples at room temperature. It is believed that this anomalous SHG arises from merocyanine aggregates stacked in the z direction being rotated by the field. © 1990, American Chemical Society. All rights reserved.

引用

页码：162 / 168

页数：7

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