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Terahertz Spoof Surface Plasmonic Logic Gates.

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Area of Science:

  • Photonics
  • Plasmonics
  • Metasurfaces
  • Terahertz Technology

Background:

  • Integrated photonic circuitry relies on efficient logic gates.
  • Terahertz (THz) frequencies offer unique properties for advanced computing.
  • Spoof surface plasmon polaritons (SSPPs) enable waveguiding at subwavelength scales.

Purpose of the Study:

  • To demonstrate fundamental logic operations using SSPP waveguides at THz frequencies.
  • To develop compact and efficient logic gates for THz integrated circuits.
  • To explore the potential of linear interference in SSPP waveguides for computation.

Main Methods:

  • Utilized a metasurface-based plasmonic source for THz radiation coupling.
  • Employed a funnel-shaped metasurface for efficient coupling into domino-structure waveguides.
  • Implemented Mach-Zehnder waveguide interferometers to realize logic functions.
  • Performed experimental validation supported by numerical simulations.

Main Results:

  • Successfully demonstrated AND, NOT, OR, and XOR logic gates using single Mach-Zehnder interferometers.
  • Achieved NAND and NOR operations by cascading two interferometers.
  • Obtained compact logic gates with high intensity contrast between '1' and '0' states.
  • Experimental results showed good agreement with numerical simulations.

Conclusions:

  • Linear interference in SSPP waveguides is a viable mechanism for THz logic gates.
  • The demonstrated logic gates are suitable for compact THz integrated computing.
  • Further development could lead to more complex functionalities for advanced photonic circuits.