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Extreme field confinement in zigzag plasmonic crystals.

Nu-Ri Park1, Han-Na Kim1, Young-Ho Jin1

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea.

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Zigzag plasmonic crystals create a broadband plasmonic mirror and enable extreme field confinement for on-chip devices. This technology achieves high field enhancement, paving the way for advanced photonic applications.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Materials Science

Background:

  • Plasmonic crystals offer unique optical properties for light manipulation.
  • Achieving broadband operation and extreme field confinement remains a challenge in plasmonic devices.

Purpose of the Study:

  • To propose and investigate zigzag plasmonic crystals for broadband operation and extreme field confinement.
  • To demonstrate the potential for high field enhancement in on-chip plasmonic devices.

Main Methods:

  • Fabrication of metal-insulator-metal plasmonic waveguides with periodic zigzag structures.
  • Analysis of plasmonic band structures and modal volumes.
  • Design of three-dimensional tapered plasmonic cavities for enhanced field confinement.

Main Results:

  • A wide plasmonic bandgap was achieved near the visible frequency range (526-909 nm).
  • Flattening of the lowest three plasmonic crystal bands resulted in a broadband plasmonic mirror.
  • Extreme field confinement with a modal volume < 0.00005 λ³ was achieved.
  • Field intensity enhancement factor exceeding 10⁵ was demonstrated via critical coupling.

Conclusions:

  • Zigzag plasmonic crystals provide a high-quality broadband plasmonic mirror.
  • The proposed structures enable extreme field confinement and significant field enhancement.
  • Zigzag plasmonic crystals offer a promising platform for broadband on-chip plasmonic devices.