Preparation, Third-order Nonlinear Optical Property and Optical Information Storage of Polyimide Attached with Azobenzene Chromophore Side-chain

Abstract

Abstract: Using aniline and benzaldehyde as raw materials, p,p'-diaminotriphenylmethane(DTM) was synthesized. Co-condensation type poly(amic acid) was prepared by using p,p'-diaminotriphenylmethane as the co-diamine monomer and pyromellitic dianhydride(PMDA) as the the dianhydride monomer. And then the nonlinear optical polyimide(NLOPI) attached with azobenzene chromophore side-chain was synthesized by diazo coupling reaction of 4-nitrobenzenediazonium tetrafluoroborate to poly(amic acid) in 1-methyl-2-pyrrolidone(NMP) and imidization reaction at 250 ℃. The designed chemical structure of production can be proved in the infrared spectrum and ultraviolet-visible absorption spectrum. The NLOPI exhibits UV-Vis absorption of the azobenzene chromophore at the wavelength of about 330 nm and 490 nm. The third-order nonlinear optical property of NLOPI was studied by degenerate four-wave mixing(DFWM). Third-order nonlinear susceptibility of NLOPI is 3.28×10^-10 esu(4.58×10^-18 m²/W). It is indicated that NLOPI has strong optical information storage through DFWM. Forward pumping light(I_f) and detecting light(I_p) are prime writing light, however backward pumping light(I_b) is principal reading light. It is proved that optical information storage can be caused by photo-induced trans-cis isomerization of azobenzene.

Key words: Azobenzene chromophore, Polyimide, Third-order nonlinear optics, Third-order nonlinear susceptibility, Optical information storage

CLC Number:

O631
O437

TrendMD:

SUN Jian-Ping, WU Hong-Cai, LI Bao-Ming, YING Zu-Jin . Preparation, Third-order Nonlinear Optical Property and Optical Information Storage of Polyimide Attached with Azobenzene Chromophore Side-chain[J]. Chem. J. Chinese Universities, 2004, 25(2): 372.

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Preparation, Third-order Nonlinear Optical Property and Optical Information Storage of Polyimide Attached with Azobenzene Chromophore Side-chain

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