Abstract

Artificial chiral plasmonic nanostructures with strong circular dichroism (CD) have wide applications in biological monitoring, analytic chemistry, and optical property research. In this paper, a tail is introduced to break the symmetry of a metal spatial cross-shaped nanostructure to create a chiral property. The calculation results of the finite element method show that the dipole of the upper tailed nanorod and that of the bottom nanorod form the Born-Kuhn model. The CD effect depends strongly on the length and the orientation of the introduced nanorod. This work provides a novel way to generate a tunable CD effect and provides potential applications for further optimization.

© 2018 Optical Society of America

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