Study on infrared emissivity of biomimetic motheye sapphire single crystal

As a focus of research on materials science, bionic structure has drawn a great deal of attention from researchers. In this paper, patterned antireflection microstructure used for space optical window was fabricated on the surface of sapphire single crystal based on “Biomimetic Motheye Structure”. Meanwhile, emissivity of patterned sapphire at high temperature was investigated. The results indicated that transmittance of sapphire increased with spectrum red shift effect because of surface microstructures; the emissivity of patterned sapphire increased with rising of temperature in 6∼11 μm band; microstructures on surface led the scattering and attenuation coefficient of light to increase, thus, the emissivity of patterned sapphire was greater than that of contrast specimen which was not patterned. At the end of the paper, an audacious conclusion was made that the effect of microstructure on emissivity would decrease or even disappear with the increase of temperature.