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Octupolar Films with Large Second Harmonic Generation and Electro‐Optical Effects
Author(s) -
Jeong MiYun,
Brasselet Sophie,
Lim TongKun,
Cho Bong Rae
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201102257
Subject(s) - materials science , second harmonic generation , indium tin oxide , polyimide , crystallite , perpendicular , second harmonic imaging microscopy , zigzag , thin film , thermal stability , nonlinear optical , optoelectronics , optics , composite material , nanotechnology , chemical engineering , nonlinear system , layer (electronics) , laser , physics , geometry , mathematics , engineering , quantum mechanics , metallurgy
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.