This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 1 Analysis of Doubly Corrugated Spoof Surface Plasmon Po

Abstract—Devices utilizing spoof surface plasmon polariton (SSPP) effect in the terahertz (THz) domain has attracted in-creasing attention because such devices can be potentially used in fast signal processing and storages. In this paper, we present a comprehensive mathematical model of the doubly corrugated SSPP (DC-SSPP) structure derived from full-field analysis. Based on the proposed model, a complete characterization of the struc-ture is carried out and properties such as dispersion relationships and S-parameters are obtained. The results show the existence of slow light modes in the DC-SSPP structure. Discrete sub-wave-length transmission bands, and sometimes sharp transmission peaks with strong EM field localization can also be achieved under certain device designs. They are compared with the simulation results obtained from the CST software package developed by Computer Simulation Technology AG. The validation as well as limitations of the derived results is also discussed in detail. Index Terms—Dispersion relationship, doubly corrugated spoof surface plasmon polariton (DC-SSPP), full-field analysis, S-pa-rameters. I