A Relaxation Study of Poled Nonlinear Optical Polymers by Infrared Reflection-Absorption Spectroscopy.
Technical rept. 1 Jun 1993-31 May 1994
MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY
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The relaxation of poled nonlinear optical NLO chromophores in polymer films was characterized by infrared reflection-absorption spectroscopy. Both a guest-host system and a photo-crosslinkable polymer system were investigated. Polymethylmethacrylate doped with either 2-methyl-4-nitroaniline or 44-nitrophenylazoaniline was studied. The photo-crosslinkable polymer system, polyvinylcinnamate doped with 3-cinnamoyloxy-4-4-N,N-diethylamino-2- cinnamoyloxy phenyl azonitrobenzene was also investigated. Doped NLO active molecules were aligned using the corona poling technique. Infrared spectra as a function of time were used to monitor the relaxation behavior of the oriented dyes after poling. Relaxation of NLO molecules was followed at various characteristic vibrational frequencies. The relaxation behavior of both systems were found to be consistent with those studied by the second harmonic generation technique. Relaxation, Nonlinear optical polymers, Infrared.
- *POLYMETHYL METHACRYLATE
- *INFRARED SPECTRA
- *NONLINEAR OPTICS
- NITRO RADICALS
- ETHYL RADICALS
- METHYL RADICALS
- SECOND HARMONIC GENERATION
- Organic Chemistry
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy