Preparation and Holographic Recording of Fluorescent Photopolymer Films Containing Anthracene Polymer for Security

Abstract

Photopolymer films containing fluorescent anthracene polymer, polymethyleneanthracene (PMAn), were prepared with different concentrations of PMAn for holographic recording useful for security documents. The fluorescent photopolymer film showed enhanced fluorescent intensity due to the micro-separation which arose from grating formation and diffusion during photopolymerization. Experimental values of diffraction efficiency were well matched to the simulated values for photopolymers having different PMAn concentrations. Holography patterning was carried out using the fluorescent photopolymer under a photo-mask. A grating was confirmed using microscope techniques in the recorded area under the pattern. Importantly the recorded area showed enhanced fluorescence compared to the unrecorded part, allowing fluorescence patterns at micro scale along with the submicron grating pattern. The fluorescence pattern recorded on the photopolymer film provides additional readability of holographic reading and thus is useful for secure recording and reading of information.

Photostability of acrylate photopolymers used as components in recording materials

“…The emerging applications of holography in optical data storage [1e4], optical elements [5,6], holographic sensor [7], artistic display [6,8] and security integrated devices [6,9] require to used highperformance recording materials with high diffraction efficiency, good spatial-frequency response and long shelf-life stability. Their ease of feasibility, self-developing character, shape flexibility and low cost make photopolymers attractive and versatile materials for holographic recording [10e16].…”

Holographic Recording Performance of Acrylate-Based Photopolymer under Different Preparation Conditions for Waveguide Display

“…[ 11 ]. Among them, photopolymer is widely used in holographic waveguide displays [ 12 , 13 , 14 , 15 ], optical holographic storage [ 16 ], holographic anti-counterfeiting [ 17 ], optical communication [ 18 ], holographic solar concentrators [ 19 ], and holographic beam-shaping diffractive diffusers [ 20 ] due to its advantages, which include high diffraction efficiency, high sensitivity, low price and easy preparation. To date a variety of photopolymers (PQ/PMMA, PVA/AA, etc.)…”