Photo-induced birefringence in DR1-doped sol-gel silica and ORMOSILs thin films

被引：44

作者：

Marino, IG ^{[1
]}

Bersani, D ^{[1
]}

Lottici, PP ^{[1
]}

机构：

[1] Univ Parma, Dipartimento Fis, Ist Nazl Fis Mat, I-43100 Parma, Italy

来源：

OPTICAL MATERIALS | 2000年 / 15卷 / 03期

关键词：

hybrid materials; sol-gel; photo-induced birefringence; Disperse Red 1; TEOS; GLYMO; ICPTEOS; photoisomerization;

D O I：

10.1016/S0925-3467(00)00032-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Photo-induced birefringence has been measured by a pump-probe experiment in pure silica and ORMOSILs (ORganically MOdified SILanes) thin films containing Disperse Red I (DR1). The films are obtained via the sol-gel process using TEOS, GLYMO and ICPTEOS as precursors. Two characteristic relaxation times have been estimated for the relaxation of the birefringence: a short time, related to the Cis --> Trans isomerization of the dye molecule, which does not depend on the hosting matrix, and a longer time, due to the angular diffusion towards the isotropy, strongly sensitive to the chemical bonding of the DR1 molecule with the host. (C) 2000 Elsevier Science B.V. All rights reserved.

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页码：175 / 180

页数：6

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