Plasmonics

, Volume 7, Issue 3, pp 417–426 | Cite as

Complex Mechanism of Enhanced Optical Transmission Through a Composite Coaxial/Circular Aperture

  • Anatoliy V. Goncharenko
  • Ki Young Kim
  • Jian-Shiung Hong
  • Kuan-Ren Chen
Article
First Online:
Received:
Accepted:

Abstract

Making use of the FDTD simulation, we study light transmission properties of a composite coaxial/circular aperture milled in a thin metallic film. Representing the aperture as consisting of segments of coaxial and hollow waveguides, connected in series, we show that there are three characteristic frequencies (the cutoff frequencies of the coaxial and hollow waveguides and the frequency of a longitudinal standing wave in the coaxial waveguide segment) and four regimes of operation (bounded by these frequencies, as well as by low- and high-frequency limits) which determine the behavior of the transmission efficiency. For two regimes of operation (for frequencies between the cutoff frequency of the coaxial waveguide and the resonant frequency of the longitudinal standing wave), both segments can contribute to the overall transmission. For other two regimes, either no enhancement occurs or only one segment contributes to the transmission efficiency. A way is proposed to optimize the transmission through the composite aperture. In particular, as we show, the transmission efficiency of the aperture can be enhanced by decreasing the exit hole size (radius of the circular aperture). In the considered case, an increase of the transmission efficiency exceeds 50%. The effect of the enhanced transmission is shown to result from both vertical and in-plane surface plasmon resonances occurring in the aperture.

Keywords

Enhanced optical transmission Annular aperture Circular aperture Hybridization theory 
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Notes

Acknowledgments

The authors thank the National Center for High-Performance Computing for computer time and facilities. The work was supported by the Ministry of Education, Taiwan, R.O.C. under the NCKU Project of Promoting Academic Excellence and Developing World Class Research Centers and the National Science Council.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Anatoliy V. Goncharenko
    • 1
    • 2
  • Ki Young Kim
    • 1
  • Jian-Shiung Hong
    • 3
  • Kuan-Ren Chen
    • 1
    • 3
    • 4
  1. 1.Department of PhysicsNational Cheng Kung UniversityTainanRepublic of China
  2. 2.Institute of Semiconductor PhysicsNational Academy of Sciences of UkraineKyivUkraine
  3. 3.Department of PhotonicsNational Cheng Kung UniversityTainanRepublic of China
  4. 4.Advanced Optoelectronic Technology Center and Research Center for Energy Technology and StrategyNational Cheng Kung UniversityTainanRepublic of China

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