薄膜的光谱发射率

摘要

In this paper,the contribution of multiple reflections in thin film to the spectral emissivity of thin films of low absorption is discussed.The expression of emissivity of thin films derived here is related to the thin film thickness d and the optical constants n(λ) and k(λ).It is shown that in the special case d→∞ the emissivity of thin films is equivalent to that of the bulk material.Realistic numerical and more precise general numerical results for the dependence of the emissivity on d,n(λ) and k(λ) are given.%本文讨论了薄膜内的多次反射对低吸收薄膜光谱发射率的影响。这里推导出的薄膜发射率的表达式与薄膜厚度d和其光学常数n（λ）及k（λ）有关。在d→∞的特殊情况下，薄膜发射率与大块材料发射率相等。给出了实际数值评价及发射率与d、n（λ）和k（λ）相互关系的更为精确的数值结果。