High-density polarization multiplexed holograms using azo-carbazole films for diverse applications

In this study, we have demonstrated diverse applications of high-density polarization multiplexed holograms in an azo-carbazole polymer film. We investigate three distinct multiplexing methods, namely i) hybrid polarization-angular multiplexing for high-density data storage, ii) hybrid spatial-polarization multiplexing for a dynamic display, and iii) hybrid polarization-depth multiplexing for depth selective 3D display. Up to 24 images were successfully recorded and then retrieved individually from a single hologram without any cross-talk, using the first multiplexing scheme. Similarly, by employing the second multiplexing scheme, six new images were composed (reconstructed) from a hologram recorded with elemental patterns. Finally, images that can be selectively reconstructed at different depths have been demonstrated using the third multiplexing scheme. In this paper, up to three data recordings at one position in the thin azo-carbazole polymer film are demonstrated for the first time to the best of our knowledge. Our findings underscore the suitability of azo-carbazole copolymer-based composite films for various applications, spanning data storage and display technologies.