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Second-order Nonlinear Optical (second-order + nonlinear_optical)

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Chemistry75%

Terms modified by Second-order Nonlinear Optical

  • second-order nonlinear optical property
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    Selected Abstracts

    High-Generation Second-Order Nonlinear Optical (NLO) Dendrimers: Convenient Synthesis by Click Chemistry and the Increasing Trend of NLO Effects,

    ANGEWANDTE CHEMIE, Issue 15 2010
    Zhong'an Li
    Klick und passt: Dendrimere der vierten und fünften Generation (siehe Struktur) mit 30 bzw. 62 Azobenzol-Chromophoreinheiten sind in befriedigenden Ausbeuten durch eine Kombination aus divergenter und konvergenter Synthese zugänglich. Die Sharpless-Klickreaktion spielt dabei eine zentrale Rolle. [source]

    Second-Order Nonlinear Optical Properties of Tetraaza-Coordinated Nickel(II) Complexes

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 14 2003
    Santo Di Bella
    Abstract In this contribution, we report the design and theoretical analysis, using the INDO/SCI-SOS quantum chemical formalism, of novel molecular architectures based on planar [N4]-, (2-aminobenzylideneiminato)- and tetraazamacrocycle-coordinated nickel(II) complexes, having second-order nonlinear optical (NLO) properties. Calculations indicate that these molecules possess comparable, or even larger, second-order nonlinearity to the bis(salicylaldiminato)NiII Schiff-base analogues. The nonlinearity of substituted complexes is dominated by the nature and position of substituents on the tribenzo[b,f,l] and/or cyclotetradecine rings, and is determined by the relative directions of the ground- and excited-state dipole moments. Moreover, substitution with acceptor groups in the dibenzo[b,l] rings involves a significant octupolar contribution to optical nonlinearity. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source]

    Synthesis of nonlinear optical polyimides containing azodiamine derivative chromophores and their electrooptic and thermal properties

    JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 14 2002
    Yuming Zhou
    Abstract Some thermally stable second-order nonlinear optical (NLO) polyimides were synthesized. The polyimides were prepared by the ring-opening polyaddition of 4,4,-(hexafluoroisopropylidene) diphthalic anhydride and pyromellitic dianhydride with two aromatic azodiamine derivatives as the NLO chromophores. These chromophores, based on a nitro group connected with azobenzene as the acceptor end of a donor,,-bridge,acceptor chromophore and a diamine group as the donor end, had specific chemical stability. On the basis of ZERNER'S INDO methods, according to the sum-over-states formula, a program for the calculation of nonlinear second-order optical susceptibilities was devised. The resulting polyimides had high number-average and weight-average molecular weights of up to 26,000 and 53,500, respectively, and a large glass-transition temperature of 248 °C. With an in situ poling and temperature ramping technique, the optimal temperatures (Topt's) for corona poling were obtained for the largest second-order NLO response. The electrooptic coefficient (,33) of a polyimide at a wavelength of 830 nm was up to 21 pm/V after corona poling under its Topt, and the value remained at elevated temperatures (>90.6% was retained at 240 °C for >120 h). The thermal stability of the NLO polyimides was studied with UV spectrometry after poling of the films. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2478,2486, 2002 [source]

    Observing Second-Order Nonlinear Optical Properties by Symmetry Breaking in Centrosymmetric Furan-Containing Oligoaryl Cyclophandienes

    CHEMISTRY - A EUROPEAN JOURNAL, Issue 47 2009
    Hsin-Chieh Lin Dr.
    Abstract Centrosymmetric furan-containing cyclophandienes 3 and 4, synthesized by our furan annulation protocol, have been shown to exhibit extraordinarily large Stokes shifts and second-order nonlinear optical , values. The , values for 3 and 4 measured at 1.32,,m are 208 and 530×10,30,esu, respectively. The , values of 3 and 4 are similar to those of respective cyclophenes 1,a and 7 in which strong hyperpoarizable interactions between two twisted ,-systems (oligoaryl and bridging double bond) might take place. Symmetry breaking due to the resonance contribution (cf. 2) and the unique structural features of 3 and 4 has been used to account for this unusual photophysical behavior. [source]