1 research outputs found
Magnetic Control of the Plasmonic Chirality in Gold Helicoids
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