Stability of nonlinear optical characteristics and dielectric relaxations of poled amorphous polymers with main-chain chromophores

Iwao Teraoka, D. Jungbauer, B. Reck, D. Y. Yoon, R. Twieg, C. G. Willson

Research output: Contribution to journalArticle

Abstract

We have studied second-order nonlinear optical properties and dielectric relaxation characteristics for two amorphous epoxy polymers based on bisphenol-A with nitroaniline-type nonlinear optical moieties covalently attached as part of the main chain. The nonlinearities, rather large immediately after corona poling, undergo a slow decay at ambient temperature (e.g., ∼29% reduction in the nonlinear coefficient d33 in 28 days), even though the nominal glass transition temperature Tg is ∼80 °C. In dielectric relaxation measurements, both the unpoled and poled samples exhibit two relaxation modes: an α relaxation attributed to glass transition and a β relaxation due to local segmental motions of the main chain. Surprisingly, the critical temperature T associated with the glass transition, obtained by a WLF [M. L. Williams, R. F. Landel, and J. P. Ferry, J. Am. Chem. Soc. 77, 3701 (1955)] fit of the α relaxation characteristics, shows a significant decrease (as much as 40 °C) with increasing poling field. Moreover, the relaxation times of temporal decay of field-induced alignment at ambient temperature, as determined from the stretched exponential function fit of birefringence changes, are found to be consistent with extrapolations from the the dielectric α relaxation characteristics of poled samples.

Original languageEnglish (US)
Pages (from-to)2568-2576
Number of pages9
JournalJournal of Applied Physics
Volume69
Issue number4
DOIs
StatePublished - 1991

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chromophores
polymers
ambient temperature
bisphenols
glass
exponential functions
decay
glass transition temperature
coronas
birefringence
extrapolation
critical temperature
relaxation time
nonlinearity
alignment
optical properties
coefficients

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Stability of nonlinear optical characteristics and dielectric relaxations of poled amorphous polymers with main-chain chromophores. / Teraoka, Iwao; Jungbauer, D.; Reck, B.; Yoon, D. Y.; Twieg, R.; Willson, C. G.

In: Journal of Applied Physics, Vol. 69, No. 4, 1991, p. 2568-2576.

Research output: Contribution to journalArticle

Teraoka, Iwao ; Jungbauer, D. ; Reck, B. ; Yoon, D. Y. ; Twieg, R. ; Willson, C. G. / Stability of nonlinear optical characteristics and dielectric relaxations of poled amorphous polymers with main-chain chromophores. In: Journal of Applied Physics. 1991 ; Vol. 69, No. 4. pp. 2568-2576.
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