滑动盖板对一维微尺度光栅红外辐射特性影响

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。

Effect of Sliding Cover Board on Infrared Radiation Characteristics of One-Dimensional Microscale Grating

Enhanced absorptance phenomenon can be found in some conditions when electromagnetic wave incident to a microscale structure surface.Based on this property,two kinds of grating structures are proposed in this paper,which are one-side and two-side sliding cover board gratings, respectively.The surface radiation characteristics of one-dimensional microscale grating with TM wave incidence are analyzed by rigorous coupled-wave analysis(RCWA) method.The results show that the Full-Width Half-Maximum(FWHM) of emission peaks formed by two-side cover board grating is wider than the one formed by one-side cover board grating while the peak value is lower. High emission peak is moving to longer wavelength as cover board closing.As cover board grows thicker,emission peaks move to longer wavelength,the emission peak formed by two-side cover board grating would grows wider and lower.