Diffractive optical element

Abstract

The invention relates to a diffractive optical element comprising at least one achromatic half-wave plate and at least one chromatic half-wave plate, each half-wave plate comprising at least two layers of a polymerized chiral liquid crystal (LC) material on a substrate, wherein at least one of the substrates has a periodic surface grating, a method for its preparation, and its use in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like non-mechanical beam steering elements, optical waveguides, optical couplers, optical combiners, optical deflectors, polarization beam splitters, partial mirrors or lenses.

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