A Relaxation Study of Poled Nonlinear Optical Polymers by Infrared Reflection-Absorption Spectroscopy

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 4(4...

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Bibliographic Details
Main Authors: Marturunkakul, Sutiyao, Chen, Jeng I, Chen, Y M, Kumar, J, Tripathy, Sukany K
Format: Report
Language:English
Subjects:
(NITROPHENYLAZO)ENILINE
ABSORPTION
AMINO
ANILINES
Atomic and Molecular Physics and Spectroscopy
CHROMOPHORES
CORONAS
CROSSLINKING(CHEMISTRY)
DOPING
DYES
ETHYL RADICALS
FREQUENCY
GUEST-HOST SYSTEM
INFRARED SPECTRA
METHYL RADICALS
METHYLNITROANILINE
MOLECULES
MONITORS
NITRO RADICALS
NITROBENZENES
NONLINEAR OPTICS
Optics
Organic Chemistry
PHOTOCROSSLINKABLE
POLED
Polymer Chemistry
POLYMERS
POLYMETHYL METHACRYLATE
POLYVINYLCINNAMATE
REFLECTION
RELAXATION
SECOND HARMONIC GENERATION
SPECTROSCOPY
TIME
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Description
Summary: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 4(4'-nitrophenylazo)aniline was studied. The photo-crosslinkable polymer system, polyvinylcinnamate doped with 3-cinnamoyloxy-4-(4-(N,N-diethylamino)-2- cinnamoyloxy phenyl azo)nitrobenzene 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.