Absorption enhancement is very important to utilize solar energy in a sustainable way to reduce the excessive consumption of traditional energy resources. We propose a polarization-insensitive broadband one-dimensional grating absorber to investigate the absorption characteristics by using finite-difference time-domain simulations. Results show that the total weighted absorptions are above 98.91% for both TM and TE polarizations at normal incidence covering the whole visible regime. The absorption enhancements are attributed to the Brewster angle and the gradient refractive index for TM polarization and to the gradient refractive index for TE polarization.
Selective Laser Melting is a rapid manufacturing technology which produces complex parts layer by layer. The presence of thermal stress and thermal strain in the forming process often leads to defects in the formed parts. In order to detect fabricate errors and avoid failure which caused by thermal gradient in time. An infrared thermal imager and a high speed CCD camera were applied to build a coaxial optical system for real-time monitoring the temperature distribution and changing trend of laser affected zone in SLM forming process. Molten tracks were fabricated by SLM under different laser parameters such as frequency, pulse width. And the relationship between the laser parameters and the temperature distribution were all obtained and analyzed.
The random antireflective structures are modeled by the analysis of the random morphology distribution. According to the effective medium theory, the transmission of the antireflective structure is calculated by dividing the structure into multilayer, and the dependence on parameters of the subwavelength is analyzed in detail. In the single-variable condition, etching depth, half breadth of distribution, and median of distribution get a positive correlation with the transmittance where the etching depth plays a most important part in enhancing the transmittance, whereas the angle of structures gets a negative correlation. The experimental results coincide well with the calculation and analysis. The analysis offers a theory guidance to fabricate random subwavelength antireflected structures using metal dewetting.
Conference Committee Involvement (1)
Eleventh International Conference on Machine Vision
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