Corona poling and real-time second-harmonic generation study of a novel covalently functionalized amorphous nonlinear optical polymer

M. Eich, A. Sen, H. Looser, G. C. Bjorklund, J. D. Swalen, R. Twieg, D. Y. Yoon

Research output: Contribution to journalArticle

216 Scopus citations

Abstract

Thin films for optical second-harmonic generation (SHG) were prepared from a newly designed and synthesized amorphous polymer that incorporated a high density of active nonlinear optical groups (p-nitroaniline as attached side groups). For alignment of the nonlinear groups a very high electric field was applied by a corona discharge to the polymer films above Tg (125 °C). The subsequent freezing process resulted in a polymer film initially exhibiting a very high second-order nonlinear coefficient, d3 3=31 pm/V, measured by the Maker-fringe technique, plus excellent thermal, mechanical, and optical properties. The dynamics of polar alignment and decay, studied by in situ poling (or depoling) and SHG measurements, indicated a multiple exponential behavior with the average relaxation time somewhat longer than expected from extrapolation of the dielectric relaxations data according to the Williams-Landel-Ferry equation. The frozen-in SHG behavior at room temperature (∼100 °C below Tg) relaxed after 5 days to a stabilized value of 19 pm/V for d33.

Original languageEnglish (US)
Pages (from-to)2559-2567
Number of pages9
JournalJournal of Applied Physics
Volume66
Issue number6
DOIs
StatePublished - 1989

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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