Characterizing the NLO chromophore orientation of polymeric film by electroabsorption spectroscopy[Nonlinear Optical]
The dispersion of third-order nonlinear coefficients {chi}{sub 1133}{sup (3)} and {chi}{sub 3333}{sup (3)} 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}{sub 3333}{sup (3)} of each material is very similar in shape to corresponding {chi}{sub 1133}{sup (3)} spectrum. The ratio of {chi}{sub 3333}{sup (3)} to {chi}{sub 1133}{sup (3)} 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 plane.
- Research Organization:
- Univ. of Massachusetts, Lowell, MA (US)
- Sponsoring Organization:
- US Department of the Navy, Office of Naval Research (ONR)
- OSTI ID:
- 20034158
- Resource Relation:
- Conference: Electrical, Optical, and Magnetic Properties of Organic Solid-State Materials IV, Boston, MA, (US), 12/01/1997--12/05/1997; Other Information: PBD: 1998; Related Information: In: Electrical, optical, and magnetic properties of organic solid-state materials IV. Materials Research Society, symposium proceedings Volume 488, by Reynolds, J.R.; Jen, A.K.Y.; Rubner, M.F.; Chiang, L.Y.; Dalton, L.R. [eds.], 977 pages.
- Country of Publication:
- United States
- Language:
- English
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