Origin of Second-Order Nonlinear Optical Effects of Nonpoled Donor–Acceptor Chromophores on Surface

• Tsuyoshi Michinobu

• Yongrong Li

• Yusuke Washino

• Kimie Murata

• Kazuma Tsuboi

抄録

Thin films of alkyl conjugated donor–acceptor (D–A) molecules, prepared by a high-yielding addition reaction between electron-rich alkynes and tetracyanoethylene (TCNE) or 7,7,8,8-tetracyanoquinodimethane (TCNQ), were investigated by ultraviolet–visible–near infrared (UV–vis–NIR) spectroscopy, in-plane and out-of-plane X-ray diffraction (XRD), and second-harmonic generation (SHG) measurements. The variable self-assembling ability of D–A chromophores produced different molecular orientations in the thin films. The TCNQ-adducted D–A molecule formed a centrosymmetric bilayer structure based on the strong interactions between the chromophores, while the film of the TCNE-adducted counter molecule was composed of interdigitated alkyl layers and randomly oriented chromophores due to their weak interactions. The interfacial interactions between a substrate and a TCNE-adducted molecular layer were expected to induce a noncentrosymmetric chromophore orientation in the thin film, which produced an effective SHG coefficient ( d eff ) of ca. 21 pm V -1 without electric poling.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 50 (9S1), 09MA06-, 2011-09-01

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360847871786634368
• NII論文ID: 210000071219
• DOI: 10.1143/jjap.50.09ma06
• ISSN: 13474065
• ISSN: 00214922
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.50.09MA06
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.50.09MA06/pdf
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