A kind of reflection filter with a narrow bandwidth and high reflectivity is designed as being composed of an all-dielectric Fabry-Perot filter, a high-reflectivity Ag film, and especially an ultrathin metallic film, n approximately = k. Exemplary structures and some formulas concerning spectral-reflection performances, such as general reflectivity, maximum reflectivity, and the halfwidth of the reflection band, are given. Experiments show the validity of this design.
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Tan et al. (1997) studied this question.
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