Dispersions of Electroabsorption Susceptibilities: Application to a Polymeric Langmuir-Blodgett Film
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).
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 24, 1997
- Accession Number
- ADA331961
Entities
People
- D. W. Cheong
- Jayant Ram Kumar
- Kexin Yang
- S. Tripathy
Organizations
- University of Massachusetts Lowell