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Plasmonics

, Volume 13, Issue 6, pp 2405–2415 | Cite as

Near-Perfect Spectral Transmission Properties for Two Cascaded Plasmonic Ultrathin Nanograting Structures

  • Bo Zhao
  • Jianjun Yang
  • Zhenfen Huang
Article
  • 88 Downloads

Abstract

A high-performance plasmonic transmission structure consisting of two longitudinally cascaded ultrathin metallic nanogratings with a half period lateral dislocated and separated by two heterogeneous dielectric layers is proposed and theoretically studied. Three near-unity spectral transmission peaks are observed for the cascaded plasmonic nanograting structure due to the evanescent field coupling of surface plasmon polariton waves supported by the two neighboring plasmonic nanogratings. The physical mechanism responsible for the near-perfect peak transmissions is discussed based on the corresponding spatial distributions of electromagnetic fields and is found to be two possible ways: by the excitation of hybrid anti-symmetric surface plasmon polariton leaky mode on the incident and transmission surfaces of the cascaded plasmonic nanograting structure or by the formation of localized surface plasmon polariton resonance modes within horizontally butt-jointed metal/insulator/metal coupled waveguides between the two cascaded plasmonic nanogratings. It is the two heterogeneous dielectric layers inserted between the two cascaded plasmonic nanogratings that is indispensable for the formation of the hybrid anti-symmetric surface plasmon polariton leaky mode, resulting in the near-unity transmission peak with an ultra-narrow bandwidth of 20 nm. The high-tunability of spectral transmission behaviors with varying structural parameters and dielectric layer are explored, which promise numerous potential applications in nano-optics devices, such as plasmonic filters, sensors, and nanoscale distance ruler.

Keywords

Surface plasmon polariton Metallic nanograting Transmission Leaky mode Waveguide resonance mode 

Notes

Funding Information

We acknowledge financial supports from the National Science Foundation of China (grant no. 11674178).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Electronic Information and PhysicsChangzhi UniversityChangzhiChina
  2. 2.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of SciencesChangchunChina

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