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电磁波入射到微尺度周期性结构表面时,一定条件下将在某一波段产生异常光吸收现象。基于该特性,本文提出了单边移动盖板光栅和双边移动盖板光栅两种光栅结构,并使用严格耦合波分析(RCWA)方法对TM波垂直入射的一维微尺度光栅表面辐射特性进行了分析,研究了滑动盖板的厚度和位置对光栅表面结构辐射特性的影响。结果表明,相同盖板厚度,双边移动盖板光栅形成的发射率峰较单边移动盖板光栅形成的发射率峰具有较宽的半高全宽(FWHM),但峰值较低;随盖板向关闭侧移动,高发射率峰对应波长向长波方向移动;随盖板厚度增加,发射率峰向长波方向移动,其中双边移动盖板光栅结构形成的发射率峰变宽,峰值变小。
Electromagnetic waves incident on the surface of microscale periodic structure, under certain conditions will produce abnormal absorption of light in a band. Based on this characteristic, two kinds of grating structures of unilateral moving cover grating and bilateral moving cover grating are proposed in this paper, and the radiation characteristics of one-dimensional micro-scale grating with perpendicular incidence of TM waves by RCWA The influence of the thickness and position of the sliding cover on the radiation characteristics of the grating surface structure was analyzed and studied. The results show that the emissivity peak formed by the double-sided moving cover grating has a wider full width at half maximum (FWHM) and a lower peak value than that of the one-sided moving cover grating with the same thickness of the cover, And the corresponding peaks of high emissivity shift to the longwave direction. With the increase of cover plate thickness, the emissivity peak shifts to the longwave direction, and the emissivity peak formed by bilateral moving cover grating grating becomes wider and the peak value becomes smaller.