有限电导率（Finite Conductivity）边界——有限电导率边界将使你把物体表面定义有耗（非理想）的导体。它是非理想的电导体边界条件。
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在有限电导率光栅的微分理论中引入校正傅里叶展开方法，改善了计算收敛性。
In order to improve the convergence rate, a correct Fourier expand method was introduced to differential theory of the finite conductivity diffraction grating.
摘要：基于有限电导率光栅的微分理论，对工作在紫外光区的全息正弦光栅和三角槽形光栅的衍射效率做了数值计算。
Abstract: Diffraction efficiency of Al-coated triangle and holographic sinusoidal grating used in UV region are calculated using the differential formalism of exact electromagnetic theory.
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