Plasmonics

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Engineered Metasurface of Gold Funnels for Terahertz Wave Filtering

  • S. Moghaddas
  • Masih Ghasemi
  • P. K. Choudhury
  • B. Y. Majlis
Article
  • 11 Downloads

Abstract

Surface plasmon polariton (SPP) excitation of the coupled light at small contact area of chromium pillars as the interface of metastructured gold funnel layer and silica medium can be enhanced locally in the gold meta-funnel-structured filter. In the present investigation, the filter is comprised of three layers, namely gold meta-funnels, nano-sized chromium pillars, and silica as the substrate. The incoming infrared (IR) waves, coupled with the excited plasmons at the first and second layers, form an excitation, known as deformed plasmon polariton. Asymmetric distribution of localized SPPs takes place owing to the inherent converging plasmonic feature of the gold funnel structure. The formation of reflection peaks with different magnitudes at different incidence angles of the polarized wave in the spectral characteristics makes the structure prominent for filtering the IR waves. Moreover, the gold meta-funnel-structured filter possesses the additional feature of distinguishing the type of polarized incidence wave. It was found that the transmission remains maximum corresponding to the normal incidence of the TE-polarized waves, whereas the TM-polarized waves over the same wavelength range are almost blocked for any value of incidence angle. The existence of transmission peaks corresponding to the TE waves demonstrates another application of this device as metastructured polarizer filter.

Keywords

Metamaterials Metamaterial-based filters Terahertz filters Photonic structures 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support received from the Ministry of Higher Education (Malaysia) to conduct the work through the grant AKU95. Also, the authors are thankful to two anonymous reviewers for constructive criticisms on the manuscript.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  • S. Moghaddas
    • 1
  • Masih Ghasemi
    • 1
  • P. K. Choudhury
    • 1
  • B. Y. Majlis
    • 1
  1. 1.Institute of Microengineering and NanoelectronicsUniversiti Kebangsaan MalaysiaBangiMalaysia

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