Use of Computer-Generated Holograms in Security Hologram Applications

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.

3D optical illusion as visualisation tools in spatial planning and development

“…Therefore, in the common understanding of holography is best known as a method of generating three-dimensional images. Both hologram technique and 3D optical illusion (commonly known as a hologram) are applied inter alia in education 51 – 54 ; medicine 55 – 58 , biotechnological sciences and industry 59 – 61 , marketing 62 – 65 , microscopy 66 , 67 , protection equipment 68 , 69 , and holographic cinema, television 70 .…”