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Proceedings Paper

Design and fabrication of a highly off-axis binary multi-phase-level computer-generated hologram based on an effective medium approach
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Paper Abstract

Computer-generated holograms (CGHs) are important for many tasks in modern optics. High efficiencies rely on an increasing number of phase steps which usually complicates the fabrication process. In this paper, we demonstrate an effective medium approach which uses binary subwavelength structures instead of a conventional surface relief profile to generate a specific phase pattern. Consequently, the fabrication process is simplified to one exposure and one etching step independent from the number of phase levels. This offers new perspectives in designing large-scale highly efficient diffractive elements with large deviation angles. For demonstration, a highly off-axis 3-level CGH for a projection screen application is designed, fabricated and experimentally evaluated.

Paper Details

Date Published: 14 February 2011
PDF: 7 pages
Proc. SPIE 7927, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IV, 792710 (14 February 2011); doi: 10.1117/12.875007
Show Author Affiliations
Wiebke Freese, Friedrich-Schiller-Univ. Jena (Germany)
Thomas Kämpfe, Friedrich-Schiller-Univ. Jena (Germany)
Ernst-Bernhard Kley, Friedrich-Schiller-Univ. Jena (Germany)
Andreas Tünnermann, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 7927:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IV
Winston V. Schoenfeld; Jian Jim Wang; Marko Loncar; Thomas J. Suleski, Editor(s)

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