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Characterizing the NLO Chromophore Orientation of Polymeric Film by Electroabsorption Spectroscopy

Published online by Cambridge University Press:  10 February 2011

Ke Yang ,
Xiaogong Wang ,
Woohong Kim ,
Aloke Jain ,
Lian Li ,
Jayant Kumar  and
Sukant Tripathy
Ke Yang
Affiliation:
Departments of Physics, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A.
Xiaogong Wang
Affiliation:
Department of Chemistry, Center for Advanced Materials, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A..
Woohong Kim
Affiliation:
Samsung Central Research Institute of Chemical Technology, Taejon, Korea 305–380.
Aloke Jain
Affiliation:
Departments of Physics, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A.
Lian Li
Affiliation:
Departments of Physics, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A.
Jayant Kumar
Affiliation:
Departments of Physics, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A.
Sukant Tripathy
Affiliation:
Department of Chemistry, Center for Advanced Materials, University of Massachusetts Lowell, Lowell, MA 01854, U. S. A..
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Abstract

The dispersion of third-order nonlinear coefficients and of three different NLO(nonlinear optical) polymer films were determined by electroabsorption spectroscopy. The first material investigated is an epoxy-based polymer BP-2A-NT, with azobenzene NLO chromophore 4-[((4-nitrophenyl)(azo)phenyl)azo)]aniline in its side chain. The other materials are two polydiacetylenes, poly(BPOD) and poly(4-BCMU), in which the( 3de)localized polymer chains contribute to the third-order nonlinearity. The complex spectrum of of each material is very similar in shape to corresponding spectrum. The ratio of to is 3.2 for BP-2ANT, 1.5 for both poly(BPOD) and poly(4-BCMU). These ratios indicate that the distribution of the side-chain NLO chromophores of BP-2A-NT is very close to three-dimensional isotropy, and the distribution of the main-chain chromophores of poly(BPOD) and poly(4-BCMU) is concentrated on the film plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 801
Copyright
Copyright © Materials Research Society 1998

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