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Polarizing and angle-sensitive color filter in transmittance for security feature applications

  • Hans Lochbihler EMAIL logo
Published/Copyright: January 15, 2015
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Advanced Optical Technologies
From the journal Advanced Optical Technologies Volume 4 Issue 1

Abstract

Subwavelength gratings comprising a stack of two thin metallic wire gratings embedded in a dielectric exhibit distinctive color properties in transmittance. Its angle-dependent coloring can be easily noticed by human observers in ambient light. Moreover, it has pronounced polarizing properties in the visible wavelength range. The optical properties of these gratings have been numerically studied. The results have been confirmed by manufactured samples replicated by a simple nanoimprint process on plastic foils. The manufacturing process is predestined for industrial mass production. Applications as authentication devices are given.

Keywords: authentication devices; coloring; subwavelength gratings
Corresponding author: Hans Lochbihler, Louisenthal GmbH, P.O. Box 1185, D-83701 Gmund, Germany, e-mail:

Acknowledgments

I thank Professor Christian Lehmann from the Max-Planck-Institut fuer Kohlenforschung for the SEM analysis.

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Received: 2014-11-4
Accepted: 2014-12-11
Published Online: 2015-1-15
Published in Print: 2015-2-1

©2015 THOSS Media & De Gruyter

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https://doi.org/10.1515/aot-2014-0056
Keywords for this article
authentication devices; coloring; subwavelength gratings

Articles in the same Issue

  1. Cover and Frontmatter
  2. Editorial
  3. Reviewer recognition and new plans for 2015
  4. Views
  5. European Photonics Industry Back to Growth in 2014
  6. Lenses for film and television: an international survey
  7. Community
  8. Community News
  9. Conference Calendar
  10. Topical issue: Micro-optics for industrial applications
  11. Editorial
  12. Micro-optics for industrial applications
  13. Tutorial
  14. High-end spectroscopic diffraction gratings: design and manufacturing
  15. Review Articles
  16. From regular periodic micro-lens arrays to randomized continuous phase profiles
  17. Micro-optics and lithography simulation are key enabling technologies for shadow printing lithography in mask aligners
  18. Research Articles
  19. Polarizing and angle-sensitive color filter in transmittance for security feature applications
  20. Micro-optics in lighting applications
  21. Letter
  22. Optical simulation of microstructured surfaces
  23. Tutorial
  24. The consequences of Petzval correction in lithographic designs
  25. Research Article
  26. Methods for describing illumination colour uniformities
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