| In recent years,optical switches were extensive use of photocommunication field because of their high speed and low loss.Azobenzene has good photoisomerization performance and can be used in optical switches.In this paper,the organic-inorganic hybrid films of titanium dioxide and germanium dioxide doped with azobenzene were prepared.They are obtained by combining sol-gel technology with spin coating method.The surface roughness,photochemical structure characteristics and light response characteristics of two kinds of organic-inorganic hybrid films under different heat treatment temperatures and different Azo contents were studied.In addition,disperse red 1 organic dye molecules were introduced into the titanium dioxide hybrid film system,and the third-order nonlinear properties of the hybrid film were researched.Specific research contents are as follows:Firstly,the surface roughness,optical waveguide mode and photochemical structure characteristics of Azo-doped titanium dioxide organic-inorganic hybrid films were studied at the heat treatment temperature of 50-500?.The conclusions show that when the heat treatment temperature of the film is lower than 200?,the surface is smooth,the photochemical structure is stable,the roughness is low and the optical waveguide characteristics are good.Moreover,the refractive index of the film changes little,and the thickness decreases with the increase of temperature.The light response characteristics of the films were researched when the heat treatment temperature was lower than 200?.The conclusion shows that the hybrid films have obvious absorption peaks at 350 nm and 450 nm wavelengths,respectively.Furthermore,by alternately irradiating the hybrid film with ultraviolet light and visible light,the photo-switch function of the film was researched.And the optical switching curve with period of 5 and optical response time of20 s was obtained.In addition,the refractive index,thickness and photochemical structure characteristics of titanium dioxide films with azobenzene content of 1wt.%,3wt.% and 5wt.% were researched.The outcome is that Azo content is directly proportional to refractive index thickness,but has little influence on Fourier infrared spectrum.The light response characteristics with different Azo content were also researched,and the conclusions indicated that that the light response characteristics were the best when azobenzene content was 3wt.%.Secondly,the surface roughness,optical waveguide mode and photochemical structure characteristics of the azobenzene-doped germanium dioxide-based hybrid films at the heat treatment temperature of 50-500? were studied.The results indicate that the film surface is smooth and the roughness is about 0.83 nm;at the heat treatment temperature below 200?.There are two or more TE guided wave modes;stable photochemical structure;the refractive index of the film is the minimum at 200?.Furthermore,the optical switching performance of the hybrid film was researched by using ultraviolet irradiation and ultraviolet-visible light irradiation at different times.The results show that the azobenzene in the thin film has undergone photoisomerization,which makes the thin film have good optical switching performance.Finally,microstructures with different shapes were prepared on the films by UV nanoimprint method.Include strip waveguide arrays,circular and hexagonal microlens arrays.In addition,disperse red 1 was introduced into the film material system,and the third-order nonlinear characteristics of titanium dioxide-based organic-inorganic hybrid films doped with azobenzene and disperse red 1 were tested by Z-scan technique.The effects of azobenzene and disperse red 1content on the third-order nonlinear characteristics of hybrid films were studied.It is expected to obtain hybrid thin film materials with better optical switch performance,which has important application value in the field of optoelectronics. |
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