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Multi-Band Circular Dichroism Induced by Surface Plasmonic Resonance in Bi-Layer Semi-Ring/Rod Nanostructure

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Abstract

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 θ, the length L of nanorod, the radius R2, and the distance D. In particular, the adjustment of θ 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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Acknowledgments

This work was supported by Open Project of State Key Laboratory of Transient Optics and Photonic Technology (No. SKLST201505), and National Natural Science Foundation of China (No. 61077072).

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Authors and Affiliations

  1. School of Precision Instrument & Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China

    Mingdi Zhang, Qieni Lu & Baozhen Ge

  2. Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin, 300072, China

    Mingdi Zhang, Qieni Lu & Baozhen Ge

Authors
  1. Mingdi Zhang
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  2. Qieni Lu
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  3. Baozhen Ge
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Correspondence to Qieni Lu.

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Zhang, M., Lu, Q. & Ge, B. Multi-Band Circular Dichroism Induced by Surface Plasmonic Resonance in Bi-Layer Semi-Ring/Rod Nanostructure. Plasmonics 13, 2111–2116 (2018). https://doi.org/10.1007/s11468-018-0727-1

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  • DOI: https://doi.org/10.1007/s11468-018-0727-1

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