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Efficient phase shift in metamaterial spoof surface plasmon polaritons waveguides.

Behnam Mazdouri1, Rashid Mirzavand

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We developed a new method for phase shift control in spoof surface plasmon polaritons (SPPs) using engineered metallic-dielectric structures. Loading the exterior region of U-shaped cells maximizes phase shift, enabling compact phase shifters for telecommunications and sensing.

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Area of Science:

  • Electromagnetics and Metamaterials
  • Plasmonics and Photonics
  • Microwave Engineering

Background:

  • Spoof surface plasmon polaritons (SPPs) enable sub-wavelength waveguiding at lower frequencies.
  • Previous research focused on material properties, neglecting systematic regional loading effects on SPP dispersion.
  • Controlling phase shifts in SPPs is crucial for advanced device development.

Purpose of the Study:

  • To propose and validate a novel method for phase shift control in SPPs.
  • To investigate the impact of systematic dielectric loading in different regions of metallic unit cells.
  • To optimize phase shift performance for compact, high-performance applications.

Main Methods:

  • Engineered bulky U-shaped metallic unit cells with dielectric loading (relative permittivity 3.2-9.8).
  • Developed a PCB-to-bulky U-shaped spoof SPPs waveguide transition for measurements.
  • Conducted theoretical analysis, experimental measurements, and near-field scanning (NEOSCAN optical probe).

Main Results:

  • Tailoring dielectric loading in the exterior cell region maximizes phase shift.
  • Achieved significant phase shifts (e.g., [Formula: see text] at 3.5 GHz with TMM10, [Formula: see text] at 5 GHz with TMM3).
  • Demonstrated a trade-off between maximum phase shift and operational bandwidth across 0.5-6 GHz.

Conclusions:

  • Systematic regional dielectric loading offers precise phase shift control in SPPs.
  • The proposed method enables the development of compact and efficient phase shifters.
  • Findings are applicable to telecommunications and sensing technologies requiring advanced wave control.