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Evanescent wave spectroscopy for the determination of the optical constants of thin silver films deposited on a silver-halide fiber

机译:van逝波光谱法测定沉积在卤化银纤维上的银薄膜的光学常数

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An unclad silver-halide fiber was coated with a 0.1-1μm silver layer and immersed in ethyl alcohol, and the fiber transmission in the range 2-20 μm was measured. The loss, induced by the metallic layer, was used to calculate the extinction coefficient,k', and the index of refraction, n', of the layer by fitting the experimental data with the time-independent perturbation theory in the complex region. The dependence of the extinction coefficient on the wavelength was found to be logarithmic, k'(λ) = κ↓(o)' exp(αλ), and not linear, as predicted by others. This simple technique may be used to study the optical constants of thin metallic films.#1997 Optical Society of America
机译:将未包覆的卤化银纤维涂覆有0.1-1μm的银层,并将其浸入乙醇中,并测量2-20μm范围内的纤维透射率。通过将实验数据与复杂区域中与时间无关的扰动理论进行拟合,可以利用由金属层引起的损耗来计算消光系数k'和层的折射率n'。发现消光系数对波长的依赖性是对数的,如其他人所预测的,k'(λ)=κ↓(o)'exp(αλ),而不是线性的。此简单技术可用于研究金属薄膜的光学常数。#1997美国光学学会

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