Antireflective Diffractive Structures

Two main groups of antireflection stmctures are single- or multilayer AR layers composed of dielectric films (interference films) [152] and single or multiple periodical diffractive stmcture of either amplitude of phase type. Multiple AR structures may have quarterwave or quarterwave/half-wave periodicity or they may be aperiodic [153]. 

F. 2.23 Appl) ing effective medium approach to diffractive antireflection structures. Here fi denotes the filling factor at different heights, the largest value being 1 and the lowest 0 /i [Pg.80]

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