Helical Magnetic Field-Induced Real-Time Plasmonic Chirality Modulation
| Autor: | Jinhae Park, Ki-Jae Jeong, Dong-Kyu Lee, Caifeng Wang, Jiawei Lv, Zhiyong Tang, Van Tan Tran, Jaebeom Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Quantitative Biology::Biomolecules
Circular dichroism Materials science business.industry General Engineering Physics::Optics General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Magnetic flux 0104 chemical sciences Nanomaterials Magnetic field Liquid crystal Optoelectronics General Materials Science 0210 nano-technology Chirality (chemistry) business Plasmon |
| Zdroj: | ACS nano. 14(6) |
| ISSN: | 1936-086X |
| Popis: | The astrophysical phenomenon of mimetic helical magnetic field (hB)-assisted self-assembly is herein introduced to build helical superstructures that display chiroptical properties. As a building block, magnetoplasmonic (MagPlas) Ag@Fe3O4 core-shell nanoparticles are used to guide plasmonic Ag nanoparticles onto a helical magnetic flux. The chirality of the assembled helical structures and tailored circular dichroism are successfully tuned in real time, and the handedness of the assembled structures is dynamically switched by the hB at the millisecond level, which is at least 6000-fold faster than other template-assisted methods. The peak position of circular dichroism can be reconfigured by altering the plasmonic resonance or coupling by controlling the size of the Ag core and magnetic flux density. The hB-induced chirality modulation represents a method to control the polarization state of light at the nexus of plasmonics, magnetic self-assembly, colloidal science, liquid crystals, and chirality. It presents active and dynamic chiral assemblies of magnetoplasmonic nanomaterials, enabling further practical applications in optical devices. |
| Databáze: | OpenAIRE |
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