<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The article discusses the use of computer-generated holograms (CGHs) for the application as one of the security features in the relief-phase protective holograms. An improved method of calculating CGHs is presented, based on ray-tracing approach in the case of interference of parallel rays.</p><p>Software is developed for the calculation of multilevel phase CGHs and their integration in the application of security holograms. Topology of calculated computer-generated phase holograms was recorded on the photoresist by the optical greyscale lithography. Parameters of the recorded microstructures were investigated with the help of the atomic-force microscopy (AFM) and scanning electron microscopy (SEM) methods. The results of the research have shown highly protective properties of the security elements based on CGH microstructures. In our opinion, a wide use of CGHs is very promising in the structure of complex security holograms for increasing the level of protection against counterfeit.</p></abstract>

The article discusses the use of computer-generated holograms (CGHs) for the application as one of the security features in the relief-phase protective holograms. An improved method of calculating CGHs is presented, based on ray-tracing approach in the case of interference of parallel rays.Software is developed for the calculation of multilevel phase CGHs and their integration in the application of security holograms. Topology of calculated computer-generated phase holograms was recorded on the photoresist by the optical greyscale lithography. Parameters of the recorded microstructures were investigated with the help of the atomic-force microscopy (AFM) and scanning electron microscopy (SEM) methods. The results of the research have shown highly protective properties of the security elements based on CGH microstructures. In our opinion, a wide use of CGHs is very promising in the structure of complex security holograms for increasing the level of protection against counterfeit.

Use of Computer-Generated Holograms in Security Hologram Applications

Innovative Microscopy Centre, Daugavpils University, 1 Parades Str., Daugavpils,

Department of Materials Engineering, Kaunas University of Technology, Kaunas,

Latvian Journal of Physics and Technical Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Use of Computer-Generated Holograms in Security Hologram Applications"}

The article discusses the use of computer-generated holograms (CGHs) for the application as one of the security features in the relief-phase protective...

Use of Computer-Generated Holograms in Security Hologram Applications

Published Online: Nov 19, 2016

Page range: 54 - 63

DOI: https://doi.org/10.1515/lpts-2016-0036

Keywords
diffractive optical elements, digital holography, protective holograms

© 2016 A. Bulanovs et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Use of Computer-Generated Holograms in Security Hologram Applications

Published Online: Nov 19, 2016

Page range: 54 - 63

DOI: https://doi.org/10.1515/lpts-2016-0036

Keywordsdiffractive optical elements, digital holography, protective holograms

© 2016 A. Bulanovs et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
diffractive optical elements, digital holography, protective holograms