Photoalignment of dye-doped cholesteric liquid crystals for electrically tunable patterns with fingerprint textures
| Autor: | Yuan Shen, Ya-Hao Ge, Rong-Guo Jiang, Yan-Chao Xu, Lujian Chen, Xiaozhong Wang, Sen-Sen Li |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Doping Nanoparticle 02 engineering and technology Grating 021001 nanoscience & nanotechnology Diffraction efficiency 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics chemistry.chemical_compound Optics chemistry Liquid crystal 0103 physical sciences Methyl red Optoelectronics Molecule 0210 nano-technology business Diffraction grating |
| Zdroj: | Optics express. 26(2) |
| ISSN: | 1094-4087 |
| Popis: | We present a convenient photoalignment approach to fabricate rewritable fingerprint textures with designed geometrical patterns based on methyl red doped cholesteric liquid crystals (MDCLCs). MDCLC systems with/without nanoparticles of polyhedral oligomeric silsesquioxanes (POSS) were employed to realize two types of sophisticated binary patterns, respectively. Based on the understanding of involved mechanisms related to boundary conditions and middle-layer theory, we demonstrated the precise manipulation of fingerprint patterns by varying the fingerprint grating vectors in different domains. Notably, the hybrid-aligned liquid crystal configuration induced by POSS nanoparticles, which leads to the electrically rotatable grating, can be converted into the planar-aligned configuration by the adsorption of photoexcited methyl red molecules onto the indium-tin-oxide (ITO) surface. In this manner, the dynamic voltage-dependent behavior of fingerprint gratings is altered from the rotation mode (R-mode) to the on-off mode (O-mode). |
| Databáze: | OpenAIRE |
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