Negative group velocity characteristics of spoof surface plasmon polaritons

Abstract

Although there have been many discussions on negative group velocity (NGV), disagreements over its counter-intuitive explanations are still on the way. In this paper, it is proposed that the negative group velocity is just a component of the actual wave group, which has to be accompanied by a positive group velocity (PGV) component. A composite wave with the NGV component propagates forward in the form of a tumbling vortex as an attenuated or evanescent wave. Negative group velocity exists only in the anomalous dispersion band with resonance absorption. This wave group model is confirmed by the NGV characteristics of spoof surface plasmon polaritons (SSPPs) of spiral-shaped periodic units. In this case, the PGV and NGV waves are formed by the resonance coupling of periodic cells, and the composite SSPP modes have both resonance absorption attenuation and vortex cancellation attenuation.

Small attenuation negative group delay of spoof surface plasmon polaritons

“…All these suggest that while the field energy is more concentrated on the metal side with negative permittivity, the SPP mode can be expected to have a NGV effect. From wave propagation perspective, the synthetic vortex wave essence for the propagation modes of NGV features is proposed, forming a quadrupole model for the realization of negative group delay [6,7]. Therefore, for spoof-insulator-spoof (SIS) guided wave structures, negative group velocity can only be realized while the slots facing the two interfaces are not perfectly symmetric [8][9][10].…”