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 photocrosslinkable polymer system were investigated. Polymethylmethacrylate (PMMA) doped with either 2-methyl-4- nitroaniline...

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Bibliographic Details
Main Authors: Chen, J I, Marturunkakul, S, Chen, Y M, Kumar, J, Tripathy, S K
Format: Report
Language:English
Subjects:
2-CINNAMOYLOXY PHENYL AZO
2-METHYL-4-NITROANILINE
4(4'- NITROPHENYLAZO)
ABSORPTION
ALIGNMENT
ANILINES
Atomic and Molecular Physics and Spectroscopy
CHROMOPHORES
CORONAS
COVALENT BONDS
CROSSLINKING(CHEMISTRY)
DOPING
DYES
FREQUENCY
FUNCTIONS
GUEST HOST SYSTEM
INFRARED SPECTRA
IRRADIATION
LIGHT
MOLECULES
MONITORS
NETWORKS
NITROBENZENES
NONLINEAR OPTICS
Optics
Organic Chemistry
PHENYLAMINES
POLED
Polymer Chemistry
POLYMERS
POLYMETHYL METHACRYLATE
PVCN(POLYVINYLCINNAMATE)
REFLECTION
RELAXATION
SPECTROSCOPY
STABILITY
THREE DIMENSIONAL
ULTRAVIOLET EQUIPMENT
VIBRATION
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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 photocrosslinkable polymer system were investigated. Polymethylmethacrylate (PMMA) doped with either 2-methyl-4- nitroaniline (MNA) or 4(4'-nitrophenylazo) phenylamine (DO3) was studied. The photocrosslinkable polymer system, polyvinylcinnamate (PVCN) doped with 3- cinnamoyloxy-4-4-(N,N-diethylamino)-2-cinnamoyloxy phenyl azo nitrobenzene (CNNB-R) 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 of MNA was found to be faster than that of DO3. The NLO dye molecule, CNNB-R was covalently bonded to the host polymer and formed a three dimensional crosslinked network after ultraviolet (UV) irradiation. Relaxation of NLO molecules in pristine and UV treated samples were compared. UV light induced crosslinking provided better temporal stability of molecular alignment in this system... Nonlinear optical polymer, Photocrosslinkable polymer, Guest- host system