Accession Number : ADA335232

Title :   Characterizing the NLO Chromophore Orientation of Polymeric Film by Electroabsorption Spectroscopy

Descriptive Note : Technical rept. 01 Jun 97-30 Sep 98

Corporate Author : MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY

Personal Author(s) : Yang, Ke ; Wang, X. ; Kim, W. ; Jain, A. ; Li, L.

PDF Url : ADA335232

Report Date : 14 JAN 1998

Pagination or Media Count : 8

Abstract : The dispersion of third-order nonlinear coefficients chi-3 1133 and chi-3 3333 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 delocalized polymer chains contribute to the third-order nonlinearity. The complex spectrum of chi-3 3333 of each material is very similar in shape to corresponding chi-3 1133 spectrum. The ratio of chi-3 3333 to chi-3 1133 is 3.2 for BP-2A-NT, 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 lane.

Descriptors :   *CHROMOPHORES, *NONLINEAR OPTICS, *POLYMERIC FILMS, *ACETYLENES, SPECTROSCOPY, DISTRIBUTION, MATERIALS, CHEMICAL BONDS, ABSORPTION SPECTRA, EPOXY COMPOUNDS, AZOBENZENES, PHENYL RADICALS, NITRO RADICALS.

Subject Categories : Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE