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Broadband nonreciprocal spoof plasmonic phase shifter based on transverse Faraday effects
Optics Express
|October 13, 2022
Summary
Researchers developed a nonreciprocal phase shifter for spoof surface plasmon polaritons (SSPPs) using the transverse Faraday effect. This breakthrough enables diode functionalities in miniaturized integrated circuits and spoof plasmonic interconnects.
Area of Science:
- Electromagnetics and Plasmonics
- Metamaterials and Nanophotonics
Background:
- Spoof surface plasmon polaritons (SSPPs) offer strong field confinement at low frequencies, crucial for miniaturized electronics.
- There is a significant demand for nonreciprocal platforms providing diode functionalities in integrated circuits.
Purpose of the Study:
- To realize nonreciprocal phase shifting in SSPPs.
- To develop a platform for nonreciprocal spoof plasmonic interconnects compatible with microstrip technology.
Main Methods:
- Constructed a plasmonic coupled line by flipped stacking two corrugated metallic strips.
- Utilized a transverse magnetized ferrite cladding to induce the transverse Faraday effect.
- Designed and validated a nonreciprocal phase shifter for SSPPs.
Main Results:
- Observed splitting of the SSPP mode into two circularly-polarized modes with different propagation constants.
- Achieved a differential phase shift of up to 46.2°/cm over a broad frequency band (12-15 GHz).
- Demonstrated breaking of time-reversal symmetry in SSPPs.
Conclusions:
- The proposed method enables nonreciprocal phase shifting in SSPPs via the transverse Faraday effect.
- The developed nonreciprocal phase shifter is compatible with standard microstrips.
- This approach offers a promising pathway for nonreciprocal spoof interconnects with strong field confinement and easy ferrite integration.
