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Lee, Jiseok
Novel Optofluidic Materials Synthesis Lab
Research Interests
  • Optofluidic photolithography
  • Nanoparticle Synthesis
  • Conjugated polymer design and Synthesis
  • Flow lithography
  • 3d printing

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Dynamic Multi-modal Holograms of Conjugated Organogels via Dithering Mask Lithography

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Title
Dynamic Multi-modal Holograms of Conjugated Organogels via Dithering Mask Lithography
Author
Oh, JongwonBaek, DaehyeLee, Tae KyungKang, DongwonHwang, HyeriGo, Eun MinJeon, InkyuYou, YounghoonSon, ChangilKim, DowonWhang, MinjiNam, KibumJang, MoonjeongPark, Jung-HoonKwak, Sang KyuKim, JungwookLee, Jiseok
Issue Date
2021-01
Publisher
Nature Publishing Group
Citation
NATURE MATERIALS
Abstract
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/48326
URL
https://www.nature.com/articles/s41563-020-00866-4
DOI
10.1038/s41563-020-00866-4
ISSN
1476-1122
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