Spoof planar surface plasmons on corrugated metal stripe and a plasmonic ring resonator design

We proposed a spoof planar surface plasmons (SPPs) on thin corrugated metal stripes in microwave and terahertz frequencies. From theoretical simulations and experiments, we show that spoof SPPs can propagate along a thin metal film by corrugating its edge with periodic array of grooves. We demonstrate that such a planar plasmonic metamaterial can sustain highly localized SPPs along two orthogonal directions. We have designed and simulated planar ring resonator in terahertz frequency, and made experiments in microwave frequency, both of which exhibit excellent performance. The proposed planar plasmonic metamaterials will play important roles in integrated plasmonic circuits and systems.