Dynamic Multi-modal Holograms of Conjugated Organogels via Dithering Mask Lithography
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- Dynamic Multi-modal Holograms of Conjugated Organogels via Dithering Mask Lithography
- Oh, Jongwon; Baek, Daehye; Lee, Tae Kyung; Kang, Dongwon; Hwang, Hyeri; Go, Eun Min; Jeon, Inkyu; You, Younghoon; Son, Changil; Kim, Dowon; Whang, Minji; Nam, Kibum; Jang, Moonjeong; Park, Jung-Hoon; Kwak, Sang Kyu; Kim, Jungwook; Lee, Jiseok
- Issue Date
- Nature Publishing Group
- NATURE MATERIALS
- Polymeric materials have been used to realize optical systems that, through periodic variations of their structural or optical properties, interact with light-generating holographic signals. Complex holographic systems can also be dynamically controlled through exposure to external stimuli, yet they usually contain only a single type of holographic mode. Here, we report a conjugated organogel that reversibly displays three modes of holograms in a single architecture. Using dithering mask lithography, we realized two-dimensional patterns with varying cross-linking densities on a conjugated polydiacetylene. In protic solvents, the organogel contracts anisotropically to develop optical and structural heterogeneities along the third dimension, displaying holograms in the form of three-dimensional full parallax signals, both in fluorescence and bright-field microscopy imaging. In aprotic solvents, these heterogeneities diminish as organogels expand, recovering the two-dimensional periodicity to display a third hologram mode based on iridescent structural colours. Our study presents a next-generation hologram manufacturing method for multilevel encryption technologies.
Periodic patterns with varying cross-linking densities are realized in conjugated polydiacetylene films, creating multiple holographic images-all dynamically responsive to exposure to various solvents-simultaneously in the same polymeric structures.
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