Surface Microstructure Changes Affect The Optical Path Of The Light Transmittance

In recent years,people have found that the surface microstructure can cause waves change in the optical path of light propagation in the material,there is a significant effect on the optical properties of reflection, light transmittance and haze rate and can improve the effectiveness of optical devices.Currently, the surface texture of the impact study of the optical properties of mature wet chemical method and photolithography; The surface texture of the material is given priority to semiconductor and silicon. Size limitations of the semiconductor thin film, the surface texture is submicron and nanometer, wet chemical etching will create voids and uneven corrosion defects; textured surface of the silicon process is difficult, not meet a large area.In order to obtain a richer texture morphology and selection of textured materials, the paper prepared by liquid writing fake plant leaf surface structure of polymethyl methacrylate, study their optical properties and optics benefits.In this paper,we using the template method to copy highlights the role of plant leaf surface microstructure.Specific process is casting the polydimethylsiloxane to plant leaf surfaces,obtain the template of polydimethylsiloxane (PDMS) with anti-structure of plant.Then use highly transparent organic material (polymethyl methacrylate) reproduced plant leaves surface texture.Optimized preparation for the plexiglass of imitation plant leaves.Study its effect of the optical properties on light transmittance, haze rate and astigmatism and study the effects of Photoelectric efficiency from imitation plant leaves plexiglass film.Adopting SEM, AFM to characterize the surface structure morphology of the bionic film, simulated light waves in the Bionic film broadcast route,and optical properties,and building the relationships between bionic surface texture characteristics and optical properties,and to explore the optical mechanism of biomimetic film.The results showed that the ratio of polydimethylsiloxane (PDMS) and curing agent was 10:1,and a temperature of 70°to the drying 4 hours to achieve ideal curing effect,and obtained high replication PDMS mold on the anti-surface of plant leaves.In order to avoid destruction of the film at the time of peeling the surface structure,we use of fluorosilane to modified low surface energy of anti-mold,to reduce the interfacial adhesion.So you can easily peel off the surface of the structure when the second replication of the two materials without damaging.In order to make the PDMS immersed in minute gap of anti-mold,we using vacuum to improve the filling capacity of the film solution during the preparation of the film.We found that the produced imitation plant leaf surface structure has high light transmittance and a high haze rate, its light transmittance greater than 85%, and haze reached 70%;and tested solar cell of photoelectric effect on bionic structure of the film,The results show that photoelectric effect can be improved,and compared to the smooth film it can be increased by 8%.We designed the light scattering experimental device of laser point source,it through the bionic film and smooth film and shot two films astigmatism rate, the results showed that bionic film astigmatism angle reaches 20° and more.But smooth film hardly changed.It prove the surface structure of bionic films changed optical path optical path,its changes were main reason for the optical properties and photovoltaic efficiency improved.With bionic film surface structure abstracted, modeled and establish geometric model.Through analog computation representative conical, circle, triangle on first-class texture and with its distribution 100-500nm grade short rod, small dots classification texture.The results showed that bionic film texture classification with lower reflectivity and high light transmittance;and nanostructure occurs diffraction phenomenon in the case of light irradiation, which is the main reason for produce light scattering phenomena and increase the optical effect when the light passes through the bionic film.