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采用严格耦合波分析方法设计了基于二维表面光栅的高温太阳能选择性吸收表面。首先根据高温太阳能选择性表面的要求,选择金属钼(Mo)作为二维表面光栅的基底材料。通过优化钼二维表面光栅的几何结构,实现对太阳能的选择性吸收。结果表明:采用等效复折射率渐变的金字塔形光栅,适当减少光栅周期,提高深宽比,可有效提高Mo二维表面光栅的太阳吸收比,同时保持较低的高温热发射比。经过结构优化的Mo表面光栅,法向吸收比α_n=0.936,法向发射比ε_n=0.0692(500℃),0.1765(1000℃),有望用于高温太阳能选择性吸收表面。
The selective absorption surface of high temperature solar energy based on two-dimensional surface grating was designed using the rigorous coupled-wave analysis method. First of all, based on the requirements of high temperature solar selective surface, metal molybdenum (Mo) is selected as the substrate material of two-dimensional surface grating. By optimizing the geometry of the molybdenum two-dimensional surface gratings, a selective absorption of solar energy is achieved. The results show that the pyramid grating with equivalent complex refractive index can reduce the grating period and increase the aspect ratio, which can effectively increase the solar absorption ratio of Mo two - dimensional surface gratings while maintaining the high high temperature heat emission ratio. The structure-optimized Mo surface gratings are expected to be used for the selective absorption of high-temperature solar energy on the surface with the normal absorption ratio α_n = 0.936 and normal emission ratio ε_n = 0.0692 (500 ℃) and 0.1765 (1000 ℃).