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Single-layer antireflection coatings on absorbing substrates for the parallel and perpendicular polarizations at oblique incidence

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Abstract

Explicit equations are derived that determine the refractive index of a single layer that suppresses the reflection of p- or s -polarized light from the planar interface between a transparent and an absorbing medium at any given angle of incidence. The required layer thickness and the system reflectance for the orthogonal unextinguished polarization also follow explicitly. This generalizes earlier work that was limited to normal incidence or to oblique incidence at dielectric–dielectric interfaces. Specific examples are given of p- and s -antireflection layers on Si and Al substrates at λ = 6328 Å at various angles of incidence.

© 1985 Optical Society of America

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Equations (31)

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