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3 October 1996 Designing effective organic nonlinear (NLO) optical materials
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In order to know how we can design effective NLO materials, we have studied several series of aromatic hydrocarbons used as NLO materials and found criteria as follows: (1) When the conjugated system is small then the nitro-group is an effective acceptor, and some of this kind of compound has a very high SHG response while fairly big conjugated compounds whose acceptor is nitro-group often reveal weak or no nonlinearity. (2) The compounds whose acceptor (-NO2) and donor (-NH2, -NHR or -NR2) are para-substituted on both ends of the conjugated chains always have very weak or SHG (second harmonic generation). (3) The substituted groups such as -CH3, -OCH3, -X(-Cl, -Br, -1) and biphenyl (C6H5C6H4-) are the best donors which are beneficial to SHG response and transparency. (4) The relatively big conjugated compounds often reveal fairly good second-order nonlinearity when greater than C equals O acts as their acceptor. We studied these laws theoretically and experimentally so as to give some useful guides to the research of the SHG materials.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yang Cao, Bo Zhao, Weiliang Zhu, and Runlai Zhang "Designing effective organic nonlinear (NLO) optical materials", Proc. SPIE 2897, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications, (3 October 1996); doi: 10.1117/12.252965;

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