DLIP holographic structuring: from basic concept to advanced monitoring methods and industrial scale production

摘要

This study reports on the application of the Direct Laser Interference Patterning method for the fabrication ofholographic motives. The advantages of this method over conventional laser processing methods in terms of resolution,flexibility and throughput are analyzed. It is showed that interference approach for formation of diffraction gratingsprovides faster fabrication speed together with enhanced visual effect of the structural colors. The control of the periodof the formed patterns provided the ability to form exact structural colors, which preserved the visibility of the motivesacross the whole structured area at certain observation conditions. The capability to improve further the fabricationspeed, required for several industrial applications, is demonstrated using a Roll-to-Roll hot embossing system, permittingto replicate holographic motives formed by DLIP on PET foils. Finally, the first tests of inline monitoring method arepresented, which is proposed for controlling the quality of the imprinted structures.