Dot-Matrix Hologram Rendering Algorithm and its Validation through Direct Laser Interference Patterning.

ABSTRACT: The fight against forgery of valuable items demands efficient and reasonably priced solutions. A security tag featuring holographic elements for anti-counterfeiting is one of them. However, the content and colours of a diffraction image that would be seen by an observer are often counterintuitive in the design stage. Here, we propose an original algorithm based on the conical diffraction formalism, which can be used to describe the variations of a diffraction image with respect to all aspects of observation. We validate the output of the algorithm by comparing it to test holograms, which we have produced by employing direct laser interference patterning (DLIP) in electrochemically grown nickel foil. We have employed a motorized femtosecond laser system to micro-machine arrays of 65 µm × 65

SUBMITTER: Tamulevicius T 

PROVIDER: S-EPMC6155248 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature