光学
材料科学
折射率
波长
光学滤波器
等效电路
滤波器(信号处理)
薄膜
计算机科学
物理
光电子学
计算机视觉
量子力学
电压
纳米技术
出处
期刊:Journal of the Optical Society of America
[The Optical Society]
日期:1952-11-01
卷期号:42 (11): 806-806
被引量:221
标识
DOI:10.1364/josa.42.000806
摘要
According to Herpin’s theorem, a symmetrical thin-film combination is equivalent, at one wavelength, to a single film, characterized by an equivalent index and equivalent thickness. If a large number of identical nonabsorbing thin-film combinations are combined, the resulting periodically stratified medium acts as a band-stop filter. In a stop band, the equivalent index of a symmetrical period is a pure imaginary; in a pass band, it is real. Equivalent indices are given for some commonly used periods. These may have values not possessed by any existing substance. These periods have proved useful in the design of optical filters and antireflection coatings.
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