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Polyamic Acid Langmuir-Blodgett (LB) Films Containing A Stable Second-Order NLO Chromophore

Published online by Cambridge University Press:  10 February 2011

D. W. Cheong ,
J. -I Chen ,
J. Kumar  and
S. K. Tripathy
D. W. Cheong
Affiliation:
Center for Advanced Materials, Department of Chemistry and Physics
J. -I Chen
Affiliation:
Center for Advanced Materials, Department of Chemistry and Physics
J. Kumar
Affiliation:
University of Massachusetts Lowell, Lowell, MA 01854
S. K. Tripathy
Affiliation:
Center for Advanced Materials, Department of Chemistry and Physics
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Abstract

Nonlinear optical (NLO) LB films of polyamic acid containing a stable NLO dye were prepared and imidized either chemically or thermally. The optical properties and molecular orientation of these LB films were studied. From the absorption spectra, we infer that the derivative of the pnitroazobenzene chromophore covalently attatched to polyamic acid did not show significant aggregation. Quadratic dependence of SHG on the number of layers in polyamic acid films indicated the noncentrosymmetric organization of polar NLO chromophores. A second-order nonlinear coefficient (d33) of 23.4 pm/V was observed at 1064 nm after absorption correction. In polyimide films, SH intensity was dramatically reduced due to the collapse of the layered structure upon imidization process. In-plane isotropy of the LB films of polyamic acid and polyimide were lost upon irradiation of polarized light.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 281
Copyright
Copyright © Materials Research Society 1996

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References

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