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在红外微纳结构吸收材料的研究中,对其等效光学常数的估计有助于理解材料的吸收、反射及辐射特性。常用的方法是依据等效介质理论将微纳结构等效为匀质材料,采用Smith于2002年提出的S参数法进行估计,而该方法没有直接反映微纳结构材料特性及几何结构与等效光学常数之间的关系。采用Drude-Lorentz模型描述红外微纳结构材料吸收性能的色散关系,根据有效电子数浓度理论和等效电路理论,以矩形结构吸收材料为代表,建立了红外微纳结构吸收材料的几何结构参数与Drude-Lorentz模型参数之间的函数关系。该模型建立了微纳材料的结构、材料参数与其光学常数之间的量化关系,为红外微纳结构吸收材料的设计提供了理论依据。
In the study of infrared micro / nano structure absorbent material, the estimation of its equivalent optical constants helps to understand the absorption, reflection and radiation properties of materials. The commonly used method is based on the equivalent medium theory equivalent to the micro-nano-structure as a homogeneous material, using Smith’s 2002 S-parameter method to estimate, but this method does not directly reflect the properties of micro and nano structure materials and geometric structure and equivalent The relationship between optical constants. Drude-Lorentz model is used to describe the dispersion relationship of the absorption properties of the infrared micro / nano structure materials. According to the theory of effective electron concentration and the equivalent circuit theory, the rectangular structure absorption material is taken as the representative to establish the geometrical structure parameters of the infrared micro / The functional relationship between Drude-Lorentz model parameters. The model establishes the quantitative relationship between the structure of the micro / nano material, the material parameters and the optical constants, and provides a theoretical basis for the design of the infrared micro / nano structure absorbing material.