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
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE