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Differential surface plasmon polaritons transmission line with controllable common mode rejection
Xue-Feng Zhang1, Jian-Xin Chen2, Rui-Feng Gao1
1School of Electronics and Information, Nantong University, Nantong, 226019, China.
Scientific Reports
|June 9, 2017
Summary
This study introduces an open-cross array transmission line for enhanced spoof surface plasmon polaritons (SPPs) confinement. A novel resonator design achieves tunable common-mode rejection in differential transmission lines.
Area of Science:
- Electromagnetics and Photonics
- Metamaterials and Plasmonics
Background:
- Existing ultra-thin plasmonic waveguides face limitations in spoof surface plasmon polaritons (SPPs) confinement.
- There is a need for efficient methods to control common-mode signals in differential transmission lines.
Purpose of the Study:
- To design and demonstrate a novel spoof SPPs transmission line using an open-cross array.
- To realize a tunable common-mode rejection filter for differential transmission lines.
Main Methods:
- Design of a thin metal film patterned in an open-cross shape array to support SPPs.
- Numerical simulations to analyze SPPs propagation constant and confinement.
- Fabrication and experimental verification of a differential transmission line pair incorporating the proposed SPPs waveguides and a resonant metal strip.
Main Results:
- The open-cross array exhibits enhanced SPPs confinement compared to rectangular groove or solid-cross structures.
- A common-mode rejection notch is successfully implemented and tuned by adjusting the resonator's metal strip length.
- Differential mode propagation remains unaffected by the common-mode rejection mechanism.
Conclusions:
- The proposed open-cross array is an effective structure for enhancing spoof SPPs confinement.
- The integrated resonator provides a tunable solution for common-mode signal suppression in differential transmission lines.
- The design is validated through consistent simulated and experimental results.
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