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Magnetic Control of the Plasmonic Chirality in Gold Helicoids
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Cited 8 time in Scopus
- Authors
- Issue Date
- 2022-10
- Publisher
- American Chemical Society
- Citation
- Nano Letters, Vol.22 No.20, pp.8181-8188
- Abstract
- © 2022 American Chemical Society. All rights reserved.Chiral plasmonic nanostructures have facilitated a promising method for manipulating the polarization state of light. While a precise structural modification at the nanometer-scale-level could offer chiroptic responses at various wavelength ranges, a system that allows fast response control of a given structure has been required. In this study, we constructed uniformly arranged chiral gold helicoids with cobalt thin-film deposition that exhibited a strong chiroptic response with magnetic controllability. Tunable circular dichroism (CD) values from 0.9° to 1.5° at 550 nm wavelength were achieved by reversing the magnetic field direction. In addition, a magnetic circular dichroism (MCD) study revealed that the gap structure and size-related surface plasmon resonance induced MCD peaks. We demonstrated the transmitted color modulation, where the color dynamically changed from green-to-red, by controlling the field strength and polarizer axis. We believe current work broadens our understanding of magnetoplasmonic nanostructure and expands its potential applicability in optoelectronics or optical-communications.
- ISSN
- 1530-6984
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