Wideband Miniaturized Design of Complementary Spoof Surface Plasmon Polaritons Waveguide Based on Interdigital...

Area of Science:

• Plasmonics and Nanophotonics
• Electromagnetics and Waveguide Technology

Background:

• Miniaturization of transmission waveguides is crucial for integrated circuits.
• Conventional methods for controlling waveguide properties can be complex.
• Spoof surface plasmon polaritons (SSPPs) offer potential for subwavelength waveguiding.

Purpose of the Study:

• To propose and demonstrate a novel broadband miniaturized transmission waveguide.
• To utilize complementary spoof surface plasmon polaritons (CSSPPs) for waveguide design.
• To introduce interdigital structures (ISs) for tunable control over CSSPP properties.

Main Methods:

• A novel SSPP design integrating a corrugated slot line with interdigital structures (ISs).
• Modulation of transmission cut-off frequency by varying the number of ISs.
• Fabrication and experimental validation of a prototype device with four ISs.
• Numerical simulations to corroborate experimental findings.

Main Results:

• The proposed CSSPP waveguide achieves broadband operation.
• The transmission cut-off frequency is tunable, decreasing from 10 GHz to 5.3 GHz with the addition of ISs.
• The degree of miniaturization is directly controllable via the number of ISs.
• Experimental results show excellent agreement with numerical simulations.

Conclusions:

• The novel CSSPP waveguide design with ISs offers effective control over cut-off properties and miniaturization.
• The proposed structure demonstrates significant potential for applications in modern plasmonic integrated circuits.
• This approach provides a flexible platform for developing advanced on-chip photonic devices.