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Vertical coupling between gap plasmon waveguides.

Galen B Hoffman1, Ronald M Reano

  • 1Department of Electrical and Computer Engineering, Electroscience Laboratory, The Ohio State University, Columbus, OH 43212, USA.

Optics Express
|August 20, 2008
PubMed
Summary
This summary is machine-generated.

This study explores vertical coupling in gap plasmon waveguides for efficient power transfer. Increasing core refractive index significantly boosts coupled power but reduces extinction ratio, impacting device performance.

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Area of Science:

  • Photonics and Nanophotonics
  • Optical Engineering
  • Waveguide Theory

Background:

  • Gap plasmon waveguides offer high confinement for optical applications.
  • Vertical coupling is crucial for power transfer and splitting in integrated photonic circuits.
  • Understanding coupling dynamics is essential for optimizing device performance.

Purpose of the Study:

  • To investigate vertical coupling in gap plasmon waveguides.
  • To analyze the impact of waveguide parameters on coupler performance.
  • To identify optimal conditions for high power transfer and splitting.

Main Methods:

  • Utilizing the supermode interference method to derive coupler parameters.
  • Employing the mode matching method for initial power distribution.
  • Validating results with three-dimensional finite difference time domain (FDTD) simulations.

Main Results:

  • Excellent agreement between simulation and theoretical models for specific gap dimensions and refractive indices.
  • Observed inverse relationship between net coupled output power maxima and coupling length minima.
  • Quantified the significant influence of core refractive index and width on coupled power and extinction ratio.

Conclusions:

  • Vertical coupling in gap plasmon waveguides is highly sensitive to geometric and material parameters.
  • Optimizing core refractive index and width can enhance power transfer efficiency.
  • The study provides critical insights for designing efficient plasmonic power couplers.