Security Holograms
Security holograms are very difficult to forge because they are replicated from a master hologram which requires expensive, specialised and technologically advanced equipment.
They are commonly used to protect banknotes, mainly for high denominations which are at greater risk. They are also used in passports Visas, certificates and many different plastic cards as well as other quality products. Holograms are classified into different types with reference to the degree of optical security incorporated in them during the process of master origination.
The main classifications are:
2D / 3D "hologram" images
These are by far the most common type of hologram - and in fact they are not holograms in any true sense of the words...
Dot Matrix
These holograms have a maximum resolution of 10 micrometres per optical element and are produced on...
Electron-beam Lithography
These types of hologram are created using highly sophisticated and very expensive electron-beam systems...
Electron-beam lithography
These types of hologram are created using highly sophisticated and very expensive electron-beam systems. This kind of technology allows the creation of surface holograms with a resolution of up to 0.1 micrometres (254,000 dpi). This technique requires development of various algorithms for designing optical elements that shapes scattered radiation patterns. This type of hologram offers features like the viewing of four lasers at a single point, 2D/3D raster text, switch effects, 3D effects, concealed images, laser readable text and true colour images.The various kinds of features possible in security holograms. Find Out More...
Dot matrix
These holograms have a maximum resolution of 10 micrometres per optical element and are produced on specialised machines making forgery difficult and expensive. To design optical elements, several algorithms are used to shape scattered radiation patterns.
2D / 3D "hologram" images
These are by far the most common type of hologram - and in fact they are not holograms in any true sense of the words. The term "hologram" has taken from a secondary meaning due to the widespread use of a multilayer image on credit cards and driver licenses. This type of "hologram" consists of two or more images stacked in such a way that each is alternately visible depending upon the angle of perspective of the viewer. The technology here is similar to the technology used for the past 50 years to make red safety night reflectorsfor bicycles, trucks, and cars. These holograms (and therefore the artwork of these holograms) may be of two layers (i.e. with a background and a foreground) or three layers (with a background, a middle ground and a foreground). The matter of the middle ground in the case of the two-layer holograms are usually superimposed over the matter of thebackground of the hologram. These holograms display a unique multilevel, multi-colour effect. These images have one or two levels of flat graphics “floating” above or at the surface of the hologram. The matter in the background appears to be under or behind the hologram, giving the illusion of depth.
