Accession Number : ADA331961
Title : Dispersions of Electroabsorption Susceptibilities: Application to a Polymeric Langmuir-Blodgett Film
Descriptive Note : Technical rept. 1 Jun 97-30 Sep 98
Corporate Author : MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY
Personal Author(s) : Yang, K. ; Cheong, D. W. ; Tripathy, S. ; Kumar, J.
PDF Url : ADA331961
Report Date : 24 NOV 1997
Pagination or Media Count : 21
Abstract : The relation between the dispersions of nonlinear optical susceptibilities X(n)(w;w,0...0) and X(n-1)(w;w,0...0) (for electro-optic process) of organic polymeric materials is studied based on the premises that the microscopic polarizabilities a, b, g, d,... are derivatives of their next lower order polarizabilities, with respect to the effective internal field F across the polarizable p-conjugated systems, and that these derivative relationships are still valid when dynamic (frequency-dependent) processes are considered. Electroabsorption spectroscopy has been used to determine the dispersion of X113(2) and X1133(3) of a polyamic acid salt Langmuir-Blodgett film containing covalently bonded azobenzene NLO chromophores. The results are consistent with our prediction, and confirm the validity of the derivative relationships proposed by Marder et al. This LB film also gives appreciable values of both X113(2) (26pm/v) and X1133(3) (2X10(exp-11) esu).
Descriptors : *POLYMERS, *OPTICAL MATERIALS, POLARIZATION, ELECTROOPTICS, SPECTROSCOPY, CHROMOPHORES, ABSORPTION, DISPERSIONS, PHASE CONJUGATION.
Subject Categories : Polymer Chemistry
Electricity and Magnetism
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE