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Synthesis of High-Tg Azo Polymer and the Optimization of its Poling Condition for Stable EO System

Published online by Cambridge University Press:  10 February 2011

Takashi Fukuda ,
Hiro Matsuda ,
Takao Shiraga ,
Masao Kato  and
Hachiro Nakanishi
Takashi Fukuda
Affiliation:
National Institute of Materials and Chemical Research (NIMC), Tsukuba 305 Japan tfukuda@nimc.go.jp
Hiro Matsuda
Affiliation:
National Institute of Materials and Chemical Research (NIMC), Tsukuba 305 Japan
Takao Shiraga
Affiliation:
Science University of Tokyo, 2641 Yamazaki, Noda 278 Japan
Masao Kato
Affiliation:
Science University of Tokyo, 2641 Yamazaki, Noda 278 Japan
Hachiro Nakanishi
Affiliation:
Institute for Chemical Reaction Science, Tohoku Univ., Sendai 980–77 Japan
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Abstract

A new material for second-order nonlinear optics was synthesized, which was a copolymer of N-phenylmaleimide, 4-isopropenylphenol and 4'-[N-ethyl-N-(4-isopropenylphenoxyethyl) amino]-4”-nitroazobenzene (PMPD). PMPD films were poled by corona-poling technique. The optical nonlinearity of poled PMPD was measured by second harmonic generation (SHG) and electro-optic (EO) effect, and it was demonstrated that this polymer had large optical nonlinearity and a very long-time stability, as was expected. These properties were thought to be sufficient enough for practical EO devices. On the other hand, from the viewpoint of the sample preparation technique, poling conditions were investigated in order to achieve the highest possible dipolar orientation. As a result, it was found that the relationship between the electric resistance of polymer film and substrate was a critical factor for corona-poling efficiency. From a simple model, it was suggested that the poled PMPD film prepared onto the glass substrate with a resistance of ˜0.8 GΩ (at 160 °C) exhibits large SHG and EO coefficients, more than ˜500 × 10−9 e.s.u (d33 at λ = 1.064 μm) and ˜70 pm/V(r33 at λ = 632.8 nm), respectively. It should be noted that this expected values are approximately twice as much as obtained under conventional corona-poling conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 813
Copyright
Copyright © Materials Research Society 1998

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