Journal
PLASMONICS
Volume 13, Issue 6, Pages 2111-2116Publisher
SPRINGER
DOI: 10.1007/s11468-018-0727-1
Keywords
Metal nanostructure arrays; Surface plasmon resonance; Optical chirality; Circular dichroism
Funding
- Open Project of State Key Laboratory of Transient Optics and Photonic Technology [SKLST201505]
- National Natural Science Foundation of China [61077072]
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Plasmonic chiroptical effects have received more and more attention for their wide application in the fields of plasmonic sensing, biological detection, and analytical chemistry. In this study, we propose a bi-layer semi-ring/rod nanostructure array. The results calculated by the finite element method show that under the exciting of left-handed circularly polarized light and right-handed circularly polarized light, the nanostructure can produce strong multi-band circular dichroism (CD) signal due to the different coupling modes of electric dipole-electric dipole or magnetic dipole-electric dipole. In addition, the CD signal is strongly dependent on the tilt angle theta, the length L of nanorod, the radius R-2, and the distance D. In particular, the adjustment of theta can realize the switching of the CD signal between appear and vanish, and the change of L can achieve manipulation only for a particular resonance mode. The results in this study show that the bi-layer semi-ring/rod array nanostructure provides guidance for the generation of CD using plasmonic nanostructures, and it also shows potential application in spectral anti-crosstalk.
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