Kinoform syntesis as an improved method to form a concealed image in optical security devices

• Опубліковано в: : Semiconductor Physics Quantum Electronics & Optoelectronics
• Дата: 2006
• Автори: Braginets, E.V., Girnyk, V.I., Kostyukevych, S.A., Kurashov, V.N., Soroka, A.A., Moskalenko, N.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2006
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/121642
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Kinoform syntesis as an improved method to form a concealed image in optical security devices / E.V. Braginets, V.I. Girnyk, S.A. Kostyukevych, V.N. Kurashov, N. Moskalenko, A.A. Soroka // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2006. — Т. 9, № 4. — С. 85-90. — Бібліогр.: 19 назв. — англ.

It is well known that one of the basic functions of security holograms is the maximal complication of their non-authorized reproduction, in other words – counterfeiting. To solve the problem, concealed images that can be observed only under special conditions are placed into a structure of the hologram. A popular way to place concealed image in Diffractive Optically Variable Image Device (DOVID) is integration into DOVID's structure of a Concealed Laser-Readable Image (CLRI). Traditionally CLRI is a 2D Computer-Generated Hologram (2D CGH), which is a digitized Interference Fringe Data (IFD) structure, computed under the scheme of Fourier-hologram synthesis. Such hologram provides inspection of the second level with portable laser reading devices. While it is being read, two (+/– 1 order of diffraction) identical images are formed. It is very interesting to achieve a CGH, which restores the image only in one diffractive order or two different images in +1 and –1 orders of diffraction.