A method for analyzing the reflection of a limited cross-sectional beam from a multilayer structure has been developed. The method is based on the beam representation in the form decomposition of the plane waves using the discrete Fourier transform. The amplitude reflection coefficient from the multilayer structure is determined for each plane wave. The field distribution of the reflected beam is determined by the inverse discrete Fourier transform. This analyzes the incidence of a Gaussian beam on the metal film in the prism structure at resonant and non-resonant wavelengths that has been carried out by the proposed method. The spectral and angular dependences in the resonance region practically coincide with the corresponding dependences when the plane wave is incident on the metal film for the beam width of more than 1.5 mm. The reflection coefficient from the metal film is practically zero when the resonance conditions are satisfied.

已经开发了一种用于分析有限截面光束从多层结构的反射的方法。该方法基于使用离散傅立叶变换分解平面波形式的光束表示。对于每个平面波，确定来自多层结构的幅度反射系数。反射光束的场分布由离散傅立叶逆变换确定。这分析了高斯光束在棱镜结构的金属膜上在共振和非共振波长下的入射率，该波长已经通过提出的方法进行了。当平面波入射到金属膜上且光束宽度大于1.5 mm时，共振区域中的光谱和角度相关性实际上与相应的相关性相符。