3 June 2004 The concept of printable holograms through the alignment of diffractive pigments
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Abstract
Iridescent Optically Variable Image Devices (IOVID) for the document security market are currently produced using thin film or diffractive interference phenomena. Special optical effects by diffractive interference depend on the alignment of a series of grooves with differet frequencies and modulations to produce Diffractive Optically Variable Image Devices (DOVIDs). These devices, more commonly know as holograms, have been exclusively restricted to foil applications. In this work, we are taking into consideration basic concepts of thin film and diffractive light interference theory together with some fundamentals of magnetic behavior of materials to create a new family of diffractive pigments. These pigments not only exhibit thin film and diffractive interference but the grooves can also be aligned along predetermined orientations in a magnetic field. This property of groove alignability opens the door to the concept of printable holograms. Different groove alignable diffractive pigments have been produced. The influence of the particle size, loading, and groove frequency has been studied. The microstructure of the groove orientable flakes has been characterized by optical and electron micrscopy, and the optical effects by goniospectrophotometry. Finally, simple DOVIDs have been produced by silkscreen printing to demonstrate the feasibility of the concept.
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Alberto Argoitia, Alberto Argoitia, Sean Chu, Sean Chu, } "The concept of printable holograms through the alignment of diffractive pigments", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.531243; https://doi.org/10.1117/12.531243
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