High-frequency on-chip communication necessitates compact plasmonic network designs, shrinking electromagnetic waves to subwavelength scales. While metallic metasurface pathways handle Spoof Surface Plasmon Polaritons (SSPPs) at microwave and terahertz frequencies, real-time reconfigurability remains challenging. We introduce a dynamically tunable metasurface employing a fishbone structure with electrostatically deflectable microbridges. Voltage application lowers the cut-off frequency and shifts the dispersion curve. Being scalable beyond 120 GHz, this leverages micro-electromechanical systems for active manipulation. We developed a tunable SSPP low-pass filter that effectively blocks SSPP transmission upon activation at a SSPP frequency of 106 GHz.
We use particle swarm algorithms to devise subwavelength waveguide array structures that serve, for example, as transmissive walls (transmittance > 88%) for microwaves with incidence angles between -80 and +80 deg or spatial filters that refract microwaves with incidence angles smaller than +/-20 deg at a refraction angle of 0 deg in the forward direction. Furthermore, we optimized radar cross section reducing (RCSR) metasurfaces by use of stimulated annealing and applied machine learning to implement an RIS, whose backward deflection angle of a normally incident wave is electrically tuned between 5 deg and 65 deg for microwaves at 31 GHz.
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