Characterizing the NLO Chromophore Orientation of Polymeric Film by Electroabsorption Spectroscopy
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 14, 1998
- Accession Number
- ADA335232
Entities
People
- Aditya Jain
- Ke Yang
- Lian Li
- W. Kim
- Xufeng Wang
Organizations
- University of Massachusetts Lowell