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Proceedings Paper

Crosslinked Epoxy Polymers With Large And Stable Nonlinear Optical Susceptibilities
Author(s): Bernd Reck; Manfred Eich; Dietmar Jungbaer; Robert J. Twieg; C. Grant Willson; Do Y. Yoon; Gary C. Bjorklund
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Paper Abstract

A novel type of second-order nonlinear optical (NLO) polymer has been prepared by the reaction between tetrafunctional nitro-substituted aromatic diamines and difunctional epoxy monomers. In these materials the NLO-active moieties are incorporated covalently into the network of a crosslinked polymer. For comparison the corresponding linear (not crosslinked) polymers have also been prepared. The noncentrosymmetry was induced by poling under strong electric fields either with electrodes in liquid crystal display type cells or by corona discharge poling of spin-coated films. The resulting nonlinear optical susceptibilities were evaluated from second harmonic generation experiments. The linear polymer prepared from 4-nitroaniline and bisphenol-A diglycidylether initially exhibits a nonlinear coefficient d33 of 31 pm/V measured at 532 nm. However, 28 days after the poling, d33 decayed to 22 pm/V. This relaxation is comparable to that of a NLO polymer containing a similar chromophore as a side group that we investigated earlier. A significant improvment of the stability of the nonlinear optical coefficients was achieved with the crosslinking epoxy NLO polymers. These materials can be easily melt- or solution-processed in the form of soluble, low molecular weight prepolymcrs. Subsequently, the prepolyiners are simultaneously poled and cured to give crosslinked polymers with high glass transition temperatures. For a crosslinked polymer synthe-sized from 4-nitro 1,2-phenylenediamine and bisphenol-A diglycidylether, a d33 value of 14 pm/V was found. This high nonlinear optical coefficient remained unchanged under ambient conditions for at least 500h. Even at 85°C no signs of relaxation were detected.

Paper Details

Date Published: 15 January 1990
PDF: 10 pages
Proc. SPIE 1147, Nonlinear Optical Properties of Organic Materials II, (15 January 1990); doi: 10.1117/12.962109
Show Author Affiliations
Bernd Reck, IBM Almaden Research Center (United States)
Manfred Eich, IBM Almaden Research Center (United States)
Dietmar Jungbaer, IBM Almaden Research Center (United States)
Robert J. Twieg, IBM Almaden Research Center (United States)
C. Grant Willson, IBM Almaden Research Center (United States)
Do Y. Yoon, IBM Almaden Research Center (United States)
Gary C. Bjorklund, IBM Almaden Research Center (United States)

Published in SPIE Proceedings Vol. 1147:
Nonlinear Optical Properties of Organic Materials II
Garo Khanarian, Editor(s)

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