A 4-LEVEL ESSENTIAL STATES MODEL OF 3RD-ORDER OPTICAL NONLINEARITY IN PI-CONJUGATED POLYMERS

被引：19

作者：

MAZUMDAR, S ^{[1
]}

GUO, DD ^{[1
]}

DIXIT, SN ^{[1
]}

机构：

[1] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550

来源：

SYNTHETIC METALS | 1993年 / 57卷 / 01期

关键词：

D O I：

10.1016/0379-6779(93)90529-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Theoretical description of optical nonlinearity in pi-conjugated polymers must necessarily include both the on-site and the intersite electron correlations. We show that only three dominant nonlinear optical channels, involving four ''essential states'', determine the bulk of the optical nonlinearity. In ideal isolated strands, third harmonic generation experiments should find two three-photon resonances, and not merely one, as has been generally assumed. Two-photon resonances other than the one due to the essential two-photon excited state will have vanishingly weak intensities due to cancellations between nonlinear optical channels with opposite signs.

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页码：3881 / 3888

页数：8

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