Holographic security media prepared from photochromic fluorescent films

Kim, Jeonghun; Kim, Eunkyoung

doi:10.1117/12.801398

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…To satisfy these interests, many kinds of photopolymer which have different functional groups have been studied [14][15][16][17][18][19]. Holographic recording results from interference of the light in photopolymer film.…”

Section: Introductionmentioning

confidence: 99%

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

Park¹,

Kim²,

Kim³

et al. 2010

Journal of the Optical Society of Korea

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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.

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