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科学通报  2015 

亚波长缓变折射率结构热辐射光谱特性

DOI: 10.1360/N972014-01279, PP. 2253-2256

Keywords: 亚波长结构,缓变折射率,光谱特性,宽光谱,时域有限差分方法

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Abstract:

从电磁场理论出发,运用时域有限差分方法研究亚波长缓变折射率结构的热辐射光谱特性,计算了阶梯结构、圆锥和金字塔3种结构表面的光谱特性,分析了结构形貌、特征参数对光谱特性的影响,研究结果表明,在空气和基底表面形成缓变折射率结构,大幅度降低了界面反射.通过调节结构形貌和特征参数能够有效调控亚波长结构表面的热辐射光谱特性,另外,讨论入射角度对阶梯结构光谱特性的影响,当角度由0°增加到30°时,阶梯结构表面平均反射率保持在5%以下,呈现较好的宽角度减反特性.

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