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 ≈ 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.
© 1997 Optical Society of America
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