title: Design of binary subwavelength multiphase level computer generated holograms.
abstract: The ability of subwavelength structures to create an artificial effective index opens up new perspectives in designing highly efficient diffractive optical elements. We demonstrate a design approach for binary multi-phase level computer generated holograms based on the effective medium approach. The phase pattern is formed by various subwavelength structures that cause a certain phase delay to an incident light wave. This binary structure approach leads to a significant cost reduction by simplifying the fabrication process. For demonstration, a three-phase level element, operating in the visible range, is fabricated and experimentally evaluated.
authors.affiliation: Institute of Applied Physics, Friedrich-Schiller-University Jena, Max Wien Platz 1, 07743 Jena, Germany. wiebke.freese@uni-jena.de
authors.forename: Wiebke
authors.initials: W
authors.lastname: Freese
authors.forename: Thomas
authors.initials: T
authors.lastname: Kämpfe
authors.forename: Ernst-Bernhard
authors.initials: EB
authors.lastname: Kley
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann