The 'hidden image' effect in security holograms and its personalization by laser demetallization

Bulanovs, A.; Tamanis, E.; Kolbjonoks, Vadims

doi:10.1117/12.2017135

Cited by 2 publications

(3 citation statements)

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“…Approximate calculation time of CGH of 5000x5000 pixels was 5 min for the "hidden image" effect [9] (Fig. 4a, b) and around 15 min for the "image in lens" effect (Fig.…”

Section: Resultsmentioning

confidence: 99%

Use of Computer-Generated Holograms in Security Hologram Applications

Bulanovs

Bakanas

2016

Latvian Journal of Physics and Technical Sciences

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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.

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“…Approximate calculation time of CGH of 5000x5000 pixels was 5 min for the "hidden image" effect [9] (Fig. 4a, b) and around 15 min for the "image in lens" effect (Fig.…”

Section: Resultsmentioning

confidence: 99%

Use of Computer-Generated Holograms in Security Hologram Applications

Bulanovs

Bakanas

2016

Latvian Journal of Physics and Technical Sciences

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“…Moreover, there are several commands to simulate the expected results. Pointing a laser beam at the hidden image, an observer can see diffracted light from each pixel, which gets under the beam on the scattering screen; the overall perception of diffraction of all such pixels produces a visual effect that corresponds to the initial graphic design [1]. The schematic of a typical optical system, which uses a diffractive optical element to convert a laser beam into a desired intensity distribution at a certain diffraction angle or propagation distance, is illustrated in Figure 5a.…”

Section: Resultsmentioning

confidence: 99%

“…It cannot be changed after electron beam recording. Each hologram replica would contain the same hidden image [1]. The increasing demands to search for new multifunctional materials and the development of new reliable methods for direct formation at the micro and nanoscale determines the relevance of the topic of this article.…”

Section: Introductionmentioning

confidence: 99%

Chalcogenide thin films as a material for holographic applications

Kolbjonoks

Krams

2023

Holography: Advances and Modern Trends VIII

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A focused electron beam was used to interact with the chalcogenide thin film substrate. The result of the interaction is presented as controlled relief formation on the substrate surface after etching in an alkaline amine solution. By managing focused electron beam parameters, diffractive optical elements and hidden image effect by means of digital hologram have been recorded. As a result, reflected laser beam of the thin film substrate in the near field represents the hidden image that has been recorded along the hologram in the background. The possibilities of practical usage of this substrate as the material for the production of holograms and diffractive optical elements are discussed.

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The 'hidden image' effect in security holograms and its personalization by laser demetallization

Cited by 2 publications

References 0 publications

Use of Computer-Generated Holograms in Security Hologram Applications

Use of Computer-Generated Holograms in Security Hologram Applications

Chalcogenide thin films as a material for holographic applications

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