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 shown to produce an index-matching layer that will reduce surface reflection by several orders of sides) are Such structures are equivalent to a quintic (fifth-order polynomial) gradient-index layer, which has magnitude. been shown to be near optimum for reducing reflection at dielectric interfaces.