Holograminio ženklo spaudas (eng. Master of holographic mark).
Tapetinio holograminio ženklo spaudas (eng. Master of a continuous holographic mark).
Tapetinio holograminio apsaugos ženklo panaudojimas produkto kokybės užtikrinimui (eng. Holographic mark usage for product security/authentification)..
Paruošto holograminio ženklo pavyzdys (eng. Sample of a finished holographic mark).
Paruošto holograminio ženklo pavyzdys (eng. Sample of a finished holographic mark).
Paruošto holograminio ženklo pavyzdys (eng. Sample of a finished holographic mark).
Paruošto holograminio ženklo pavyzdys (eng. Sample of a finished holographic mark).
Holograminio ženklo spaudo SEM mikrografijos: dot-matrix taškai, sudaryti iš kintamo periodo ir orientacijos linijų (eng. SEM micrograms of a holographic mark master: dot-matrix dots formed of varied period and differing orientation lines).
Holograminio ženklo spaudo SEM mikrografijos: metapaviršius, sudarytas iš kintančios orientacijos anizotropinių metaatomų (eng. SEM micrograms of a holographic mark master: metasurface formed out of anisotropic varied orientation metaatoms).
Holograminio ženklo spaudo SEM mikrografijos: metapaviršius, sudarytas iš kintančios orientacijos anizotropinių metaatomų (eng. SEM micrograms of a holographic mark master: side view (a), crossection: (b) dot-matrix, (c) metasurface).
A dot-matrix mark consists of dots (pixels) that are, in turn, composed of periodic grooves. These dots can be considered as individual, independent diffraction gratings. When illuminated with white light, a colorful image is observed, which varies depending on the angle of illumination and viewing. When the parameters of these gratings, i.e., period, orientation, and size, vary across the plane of the mark, a projected image with rainbow colors can be formed. Moreover, by appropriately selecting the variation laws of the grating parameters, various kinematic effects can be obtained, which are observed when rotating the mark.
To enhance the security level of advanced holographic marks, modern meta-optics technology is also employed. Meta-optics elements are a two-dimensional variant of metamaterials, specially designed to perform specific optical functions. Such metasurfaces are composed of nanostructures smaller than the wavelength, arranged in a period smaller than the wavelength. A rainbow effect is no longer observed from such an element. Each element of the metasurface – a meta-atom – encodes a specific effect on the transmitted or reflected electromagnetic wave, e.g., amplitude, phase, polarization, or various combinations of these parameters can be modulated. Traditionally, pre-known information about the phase of the electromagnetic wave is encoded in metasurfaces. Thus, knowing the phase distribution on the surface of an optical element, such as a lens, wave plate, or hologram, by appropriately arranging the meta-atoms of the required phase on the surface, the functionality of the corresponding optical elements can be obtained.
