A method of constructing an interference filter by combining samples of a layered-structure compound in series is proposed. The use of single crystals of layered-structure compounds has the advantage of perfect crystal surfaces and low absorption coefficients. The possibility of designing an optical filter with predetermined characteristics in any wavelength of the near-infrared region is emphasized. Such a filter shows a relatively high transmittance maximum at the desired wavelength, which depends on the thickness of the samples used, and a controlled half-width. Infrared filters using the layered-structure semiconductor SiTe2 are described.
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