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Design of binary subwavelength multiphase level computer generated holograms

: Freese, W.; Kämpfe, T.; Kley, E.-B.; Tünnermann, A.


Optics Letters 35 (2010), No.5, pp.676-678
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

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 multiphase 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.