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Aperture-coupled MIM plasmonic ring resonators with sub-diffraction modal volumes.

Z Han1, V Van, W N Herman

  • 1Department of Electrical & Computer Engineering, University of Alberta Edmonton, AB, T6G 2V4, Canada. zhanghua@ualberta.ca

Optics Express
|August 6, 2009
PubMed
Summary

We developed ultracompact plasmonic ring resonators using metal-insulator-metal waveguides. These resonators achieve submicron bending radii and sub-diffraction cavity volumes, enabling enhanced light coupling for advanced photonic devices.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Optical Engineering

Background:

  • Plasmonic ring resonators are crucial for miniaturizing optical devices.
  • Achieving submicron bending radii in plasmonic waveguides remains a challenge.
  • Efficient light coupling is essential for resonator performance.

Purpose of the Study:

  • To propose and investigate ultracompact aperture-coupled plasmonic ring resonators.
  • To achieve submicron bending radii using strongly-confined metal-insulator-metal plasmonic waveguides.
  • To enhance light coupling efficiency via small apertures.

Main Methods:

  • Utilizing metal-insulator-metal plasmonic waveguides.
  • Designing aperture-coupled resonators with submicron bending radii (500 nm).

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  • Employing analytical modeling and rigorous Finite-Difference Time-Domain (FDTD) simulations.

    • Main Results:

    • Demonstrated 500 nm-radius plasmonic ring resonators.
    • Achieved low insertion loss and wide free spectral range.
    • Obtained sub-diffraction cavity volumes (< 0.1(lambda(0)/n(eff))(3)).

    Conclusions:

    • Ultracompact plasmonic ring resonators with enhanced coupling are feasible.
    • The proposed aperture-coupling mechanism enables significant miniaturization.
    • These resonators offer potential for highly integrated photonic circuits.