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The preparation and properties of new nonlinear optical film

Author: HaoPeng
Tutor: LiWei
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: Organic NLO material Chromophore Polarization Self-assembled LBL UV exposure
CLC: TN25
Type: Master's thesis
Year: 2008
Downloads: 153
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Abstract


Nonlinear optical (NLO) as an emerging discipline in laser technology, optical communications, data storage, optical information processing, has a very attractive prospect. Compared to inorganic NLO materials, especially organic NLO polymer materials performance, developing very rapidly, and has attracted many research institutions at home and abroad, as well as military departments attach great importance. On the basis of the papers in more detailed introduction to organic nonlinear optical materials characteristics, development status, and the latest research progress, focus on the two new organic nonlinear optical materials: one by the electric field polarization dipolar molecules into the the oriented organic poled polymer to another through Layer-by-Layer self-assembly (SA) second-order nonlinear optical processes are assembled film material. In the poled polymer, respectively, the new chromophore molecules DCDHF-2-V and GW-1-SF incorporated into the good optical properties of the polymer PMMA matrix, prepared using the spin coating method and the film SYSTEM two host-guest doped polymer film, and the refractive index and thickness of thin films using spectroscopic ellipsometry measurements. Analysis discussed polymer was purified substrate-cleaning process of the organic polymer solution was prepared and rejection gum forming; With the corona polarization and contact polarization of two different methods, the polymeric film was prepared extremely orientation of the films exhibit macroscopic non-central symmetry. UV - visible spectrophotometer (UV-Vis) analysis of polarization before and after the absorption spectrum of the polymeric film to obtain the maximum absorption peak of the two polymer films were 550nm and 505nm, polarization order parameter φ is 0.17 and 0.20. Observed with the atomic force microscope (AFM) polarization before and after the surface morphology of the polymer film, and found that the polarization of the front surface of the polymer film formation, film uniformity, the polarized film surface spikes, and oriented along the direction of the electric field polarization effect. Second harmonic method (SHG) test showed that the two materials have higher second-order nonlinear characteristics of DCDHF-2-V/PMMA composite film nonlinear optical coefficient d the 33 value of 15.2 pm / V, while GW-1-SF/PMMA composite film nonlinear optical coefficient d 33 value of 17.8 pm / V. Discussed on the basis of the experimentally obtained d 33 values, d 33 and d 13 relationship. LBL second-order nonlinear assembled monolayer, we synthesized the the cationic polyelectrolyte DAR containing diazo groups assembled multilayer films with azo polyanion electrolyte PAZO of conduct, assembling finished by UV exposure the electrostatic interactions between the layers into a covalent bond connection then the structure and stability of the layer of material. UV-visible (UV-Vis) absorption spectra show that the film assembly process has good automated, continuous controllability and integrity. Crosslinking through the illumination, with the original dipole chromophore molecules to become a covalent bond with the connection change based on the electrostatic interaction between platelet than unexposed film layer by the exposed film showed a better stability of the anti-solvent . Although it can not be accurately measured LBL self-assembled film refractive index, and thus can not be drawn to determine the value of the materials second-order nonlinear optical coefficient, but this film-forming method is simple, without the usual preparation of organic NLO film after polarization process, and therefore has the potential significant academic value.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics
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