Accession Number:

ADA265797

Title:

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

Descriptive Note:

Technical rept. 1 Jun 92-31 May 93,

Corporate Author:

MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY

Report Date:

1993-05-31

Pagination or Media Count:

24.0

Abstract:

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 44-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

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE