New Anti-Counterfeit Technology - Pressure Sensitive Holograms
Dublin Institute of Technology (DIT) researchers have invented a unique, patented hologram that changes colour under pressure and has widespread applications for security, authentication and environmental sensing. Holograms are frequently used for security and authentication, and are commonly found on credit cards, bank notes, passports and concert tickets, as well as on a number of high value goods such as pharmaceutical drugs, clothing and accessories. They can also be used as sensors if the hologram is sensitive to changes in its environment, and for tamper detection for document security. Current holographic solutions are usually mass produced from a single master hologram, resulting in identical holograms, with serialisation applied via standard overprinting, allowing the holograms to be either tampered or copied. The pressure-sensitive optical device developed at DIT allows the production of true individual holograms. Specific customer codes can be embedded into the actual hologram during manufacture, making them extremely difficult to copy but very easy for the end user authentication through a pressure-induced colour change of the hologram. The colour change can be either temporary or permanent, depending on specific requirements. This optical device can be a purely visual feature to be used for authentication by the end customer/consumer using thumb pressure, or it can also be designed to be machine readable for automated checking within the supply chain.