On the Lamellar Reflectivity for Multiple Reflections
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概要
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For the reflection of light from a thin film on basic material, namely, from two boundary surfaces, the generalized Fresnel equation for normal incidence is numerical formula……(a) and the convenient expression to calculate the lamellar reflectivity of a single layer on a basic material is numerical formula……(b) This can also be interpreted as a reflection from a single surface of a hypothetical medium with the amplitude ratio E_r/E_0 Consequently, the reflection from two thin films on a basic material, namely, from three boundaries, can be reduced to the case of a single layer on the above hypothetical medium. Then, if the optical constants (n, k) of this hypothetical medium are induced and these constants are used for those of resultant layer, the lamellar reflectivity from two films on a basic material will be calculated as above by equation (b). This process can be applied to multiple films on a basic material. With these facts in mind, the mathematical analysis of the lamellar reflection from a thin film or multiple thin films on a basic material was made, and these calculated results were compared with the published experimental data, and a reflection type interference filter with ZnS dielectric layer on an opaque aluminium mirror has been produced. This method of calculation will be used in producing the interference filters, multilayer films of high reflecting power, and in reducing the reflection from glass by multilayer films, etc.
- 東北大学の論文
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