PYRAMID-ARRAY SURFACE-RELIEF STRUCTURES PRODUCING ANTIREFLECTION INDEX MATCHING ON OPTICAL-SURFACES

Surface-relief structures having the form of an array of modified pyramids (having curved rather than flat triangular sides) are shown to produce an index-matching layer that will reduce surface reflection by several orders of magnitude. Such structures are equivalent to a quintic (fifth-order polynomial) gradient-index layer, which has been shown to be near optimum for reducing reflection at dielectric interfaces.