Octupolar films with large second harmonic generation and electro-optical effects

Mi Yun Jeong, Sophie Brasselet, Tong Kun Lim, Bong Rae Cho

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Thin films that benefit from efficient octupolar molecular packing are prepared for second harmonic generation (SHG) and electro-optic (EO) applications. The films are composed of 1,3,5-tricyano-2, 4,6-tris(p- diethylaminostyryl)benzene (TTB) in a ploymethylmetacrylate (PMMA) matrix on aluminum/BK7 glass (Al/BK7) and polyimide/indium tin oxide (PI/ITO) substrates. Octupolar films prepared on both substrates display polycrystalline and cylindrical domains. The molecular orientation, SHG efficiencies, and EO coefficients of the crystalline domains are measured. In the cylinders, the molecular crystal planes are oriented perpendicularly to the major cylinder axis, whereas in the polycrystals, the planes are randomly oriented. While both structures exhibit high and stable SHG and EO efficiencies, the cylinders, in particular, exhibited a very large SHG, a large EO coefficient, and high thermal stability; these characteristics will be useful in second order nonlinear optical applications. Octupolar films composed of 1,3,5- tricyano-2,4,6-tris(p- diethylaminostyryl)benzene (TTB) octupolar molecules display both polycrystalline and cylindrical domains. The molecular orientation, second harmonic generation (SHG) efficiencies, and electro-optic (EO) coefficients of the crystalline domains are studied theoretically and experimentally. Both structures exhibit high and stable SHG and EO efficiencies. These characteristics will be useful in second order nonlinear optical applications.

Original languageEnglish
Pages (from-to)788-796
Number of pages9
JournalAdvanced Functional Materials
Volume22
Issue number4
DOIs
Publication statusPublished - 2012 Feb 22

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Keywords

  • electro-optical effects
  • metal-enhanced effects
  • octupolar films
  • second harmonic generation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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