The Third-order Nonlinear Optical Properties Of The Thin Film Containing Azine Compounds

The optical thin film materials, such as eyeglasses, digital cameras, various household electrical appliances, precision optics and communication materials, played an important role in modern society. It is one of the fundamental materials for modern optoelectronics and telecommunication technology. In our previous work, high pure benzoxazium, phenothiazinium, phenoxazinium compounds have been successfully synthesized. Research has shown that these types of molecules in solution have the phenomena of very strong reverse saturable absorption and refraction, and compounds of this kind have the properties of good stability and solubility. Thus the research on the optical properties of the thin film material formed from compounds of these several types demonstrates theoretical as well as practical values in the field of optics.In order to further explore the application of triazine compounds in the optical and related fields, in this paper, phenothiazinium molecules and phenoxazinium molecules with good properties are selected to be separately doped with poly methyl methacrylate (PMMA) by spin-coating to form thin films. The linear optical properties were determined by both UV/Vis and fluorescence spectra method, and their nonlinear optical properties were measured in detail using Z-scan technique. In addition, we also design and synthesize the derivatives of phenoxazinium, the hydroxyl-substituted compound, to react with siloxane, and then we research the third-order nonlinear optical properties of its spin-coated film. The work can be summarized as the following:1. The phenothiazinium dye with preferable nonlinear optical properties in solution is selected to mix with PMMA, and the thin films with different doping ratios are fabricated by spin-coating. The UV-vis absorption, optical stability and third-order nonlinear optical properties are studied, and this kind of thin films is shown to be stable and have a high third-order nonlinear absorption coefficient.2. The phenoxazinium dye which has excellent nonlinear optical properties is chosen to mix with PMMA. The thin films are prepared by spin-coating according to different doping ratios. Meanwhile, the derivatives of the phenoxazinium molecule are also synthesized, and the thin films with different reaction ratios are prepared by the sol-gel method. The UV-vis absorption, optical stability, and third-order nonlinear optical properties of these films made by the two different methods are discussed; good stability and high third-order nonlinear absorption coefficients are also found.3. A series of the oxygen-containing heterocyclic compounds with the resonance structures are synthesized and characterized. And their optical properties, such as the absorption, fluorescence emission are studied, so as to investigate the influence of the properties of the substituents on the electronic spectra.