Abstract
Chirality has substantial applications in the fields of medicine, biology, and physics. Previous studies of strong chiral responses mostly involved complex 3D plasmonic nanostructures. In this study, we demonstrate a planar plasmonic composite nanostructure to achieve large circular dichroism (CD) effect by tuning the coupling effect. By introducing a rectangular block to an L-shaped nanostructure, the resonance wavelength at different handed circular polarization incidences is separated. At the same time, the resonance of the composite nanostructure is observable for one circularly polarized light excitation but subdued for another circularly polarized light excitation, leading to a large CD effect. In addition, the CD effects of composite nanostructures are strongly dependent on the structural parameters. These results could provide a novel approach to tune resonance wavelengths and achieve larger CD effects.
Published Version
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