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All‐optical poling behavior in side‐chain azobenzene homopolymer
Author(s) -
Guo Bin,
Su Wei,
Jia Yajie,
Li Zengchang,
Zhang Qijin,
Wang Gongming
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200402113
Subject(s) - poling , azobenzene , methylene , materials science , side chain , molecule , absorption (acoustics) , second harmonic generation , methacrylate , polar , chain (unit) , polymer chemistry , photochemistry , chemistry , polymer , optics , optoelectronics , monomer , organic chemistry , ferroelectricity , physics , composite material , dielectric , laser , astronomy
All‐optical poling of side‐chain azobenzene homopolymers PCN2 and PCN6, i.e. poly (6‐[4‐(4‐cyanophenylazo) phenoxy] x ‐methylene methacrylate) for x = 2 and 6, with different spacer lengths was experimentally investigated. Due to the low absorption of the samples at 532 nm, it was found that there is a nearly quadratic increase in second‐harmonic generation (SHG) when the film thickness of the sample films increases from 4 μm to 100 μm. The time constant τ A of the fitted photoinduced SHG decay process shows that PCN2 and PCN6 have higher temporal stability than the typical guest–host DR1‐PMMA system, and different methylene conjugation lengths give slightly different time constants for disorientation. The possible reason from the molecule structure is discussed in detail. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)