Low cost diffraction images for high security application

Due to the unprecedented development of the commodity economy, the market competition has become more and more fierce, and the situation of products being copied has occurred frequently. It has a wide range of spreads, great harm, and the inferiority of counterfeiting techniques. In order to prevent counterfeiting, scientists have carried out research on anti-counterfeiting technology. After decades of research, it has proposed to replace the existing plate-making trademark with “holography”, thus ensuring the protection of trademark forgery. At present, laser hologram labels are widely used in the fields of salt, imported food, cigarettes, medicines, and home appliances. At the same time, due to the landscaping and anti-counterfeiting characteristics of laser holographic packaging materials, it not only adds safety to the products, but also creates a high-end image for the products, improves the product grade, and thus creates a good shelf effect, which is being used by more and more enterprises. Accepted by the brand. At present, it is widely used in tobacco, wine, cosmetics and other high value-added products as well as pharmaceuticals, food, automotive supplies and other industries.

A hologram containing information recorded such a manner that it is difficult to read. A hologram contains photoelectrically readable information recorded so as to be reconstructible only with a specific invisible wavelength in the infrared or ultraviolet region. It is difficult to read the information recorded on the hologram unless information about the wavelength of diffracted light for reconstruction is given. The hologram is also difficult to forge and hence suitable for security purposes. They are used widely in several banknotes around the world, in particular those that are of high denominations. They are also used in passports, credit and bank cards as well as quality products.

hologram label

A hologram on a Nokia mobile phone battery. This is intended to show the battery is ‘original Nokia’ and not a cheaper imitation.

hologram label

A hologram label on a paper box for security

Holograms are classified into different types with reference to the degree of level of optical security incorporated in them during the process of master origination. The different classifications are described below:

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 on 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 reflectors for bicycles, trucks, and cars.

Dot matrix

These holograms have a maximum resolution of 10 micrometres per optical element and are produced on specialized machines making forgery difficult and expensive. To design optical elements, several algorithms are used to shape scattered radiation patterns.

Flip flop

Flip-flop hologram master origination is a technique used to produce holograms that display flip-flop effect. They are produced used 2D/3D master shooting system. This two channel effect of 2D/3D holograms displays two different images from different angles. These holograms are often fabricated using supreme quality material. The final master obtained from this flip-flop mastering technique are used to manufacture holograms which gives flip-flop effects. Having an excellent blend of 2D/3D and flipping images offers holographic images an excellent depth and a dazzling appeal.

Electron-beam lithography

These types of hologram are created using highly sophisticated and very expensive electron-beam lithography 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.

With the increase of globalization in trading and online shopping, phony products are on the rise in the market. However, the advent of holographic technology can effectively prevent counterfeiting with low cost. Based on the continuous advancement and improvement of technology, holographic anti-counterfeiting technology will be spread more widely in the future.