Decoupling from spoof surface plasmon polaritons waveguide by periodic reversal of cross-linking architecture

Abstract

We propose a method for decoupling of spoof plasmon-polaritons (SPPs) which are highly confined on two anti-parallel ultra thin corrugated strips. Periodic reversal of cross linking element between the two parallel pair, which can ensuring the continuity of the transmission waveguide and results in a π -phase shifting with the adjacent inversion units. At the junction between adjacent cells, periodic discontinuity of structure can be viewed as a perturbation to generate space harmonic, generating a mixed mode is operation in its leaky-wave region, thereby enabling the efficient coupling of surface-plasmon mode into free-space radiating modes. Leaky wave concept has found innovative applications in wavefront engineering, and we expect that these ideas could be an alternative to transform the spoof surface-plasmon mode into radiation.