新型非线性光学薄膜的制备及性能分析-preparation and performance analysis of novel nonlinear optical films.docxVIP

AbstractAbstractNonlinear optics, as a new subject, has showed great application foreground in the fields of modern laser technology, optical communication, data storage, optical information processing, etc. in the past decades. The organic polymer has developed rapidly and attracted considerable attentions by scientific research institutions, companies and military, due to its superior NLO characteristics compared with inorganic materials.Several mainly used NLO materials were reviewed in this thesis, second-order organic polymer NLO materials and their latest progress were recited. In our research, we study two kind of organic nonlinear optical material. One is organic poling polymer material, the other one is organic LBL assembly material.The new organic nonlinear optical(NLO) chromophore molecules DCDHF-2-V and GW-1-SF were doped in poly (methyl methacrylate) (PMMA) respectively with a certain concentration by weight. The DCDHF-2-V/PMMA polymer thin film was fabricated by spin-casting method. For a macroscopic second-order NLO effect, the film was corona poled to induce a noncentrosymmetric organization of chromophore dipoles. For GW-1-SF/PMMA polymer thin film, we use a new method to deposite the polymer thin film. For the sake of fitting, we choose touching poling for this depositing method. Details of purification of the polymer, cleanouting of the substrate, preparing of the solution and the process of spin-casting techniques were described in this thesis.The different two polymer thin films have been investigated by the UV/Visible absorption spectra before and after poling. The Atomic Force Microscopy (AFM) images of the polymer films showed that the surface of the film sample is extremely flat and clean. The refractive index and the thickness of the film were measured by ellipsometer. The second-order nonlinear coefficient d33 value of the two different kind of thin films reached 15.2pm/v and 17.8pm/v at 1064 nm wavelength. The relation between the second-