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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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A wide bandgap plasmonic Bragg reflector.

Jian-Qiang Liu1, Ling-Ling Wang, Meng-Dong He

  • 1School of Physics and Microelectronic, Hunan University, Changsha 410082, China.

Optics Express
|June 11, 2008
PubMed
Summary

This study numerically investigates surface plasmon polaritons (SPPs) Bragg reflectors. Introducing periodic grooves in metal-insulator-metal waveguides widens the photonic band gap (PBG) for enhanced optical properties.

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Area of Science:

  • Photonics and Nanophotonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Surface plasmon polaritons (SPPs) are essential for nanoscale optical phenomena.
  • Metal-insulator-metal (MIM) waveguides are key structures in plasmonics.
  • Photonic band gaps (PBGs) are crucial for controlling light propagation.

Purpose of the Study:

  • To numerically investigate SPP Bragg reflectors with improved optical properties.
  • To engineer a wider PBG in MIM waveguides.
  • To introduce SPP nanocavities within the proposed structure.

Main Methods:

  • Numerical investigation of SPP Bragg reflectors.
  • Introduction of periodic grooves on MIM waveguide surfaces.
  • Insertion of a high-refractive-index dielectric material.
  • Finite difference time domain (FDTD) simulations.

Main Results:

  • Achieved periodical changes in effective refractive index, creating a PBG.
  • Successfully widened the PBG by inserting a higher refractive index dielectric.
  • Confirmed the widened bandgap using FDTD simulations.
  • Demonstrated the creation of an SPP nanocavity by disrupting periodicity.

Conclusions:

  • The proposed SPP Bragg reflector design enhances optical properties.
  • Periodic groove arrays and dielectric insertion effectively widen the PBG.
  • The structure allows for the creation of SPP nanocavities for further applications.