Demonstration of a Terahertz Coplanar-Strip Spoof-Surface-Plasmon Polariton Low Pass Filter

Abstract

There is a growing interest in Spoof Surface Plasmon Polariton (SSPP) structures at Terahertz (THz) frequencies for applications such as filtering, sensing, and communications. However, to date, there are limited experiments which confirm SSPP characteristics at THz frequencies. The majority of literature focuses on simulation or verification by device scaling down to Gigahertz (GHz) frequencies where standard vector network analyzers are readily available. This paper presents the first experimental verification of SSPP characteristics at THz frequencies in a guided wave system useing coplanar strip (CPS) feedlines. Specifically, we design three SSPP structures with varying band-edge frequencies (1.04 THz, 0.63 THz, and 0.53 THz), then fabricate and verify the low-pass transmission characteristics using a modified THz-time-domain spectrometer (THz-TDS) system. We find strong agreement between simulation, theory, and experiment.

Effects of Variation in Geometric Parameters and Structural Configurations on the Transmission Characteristics of Terahertz-Range Spoof Surface Plasmon Polariton Interconnects for Interchip Data Communication: A Finite Element Method Study

“…The bandwidths are significantly higher in [35][36][37], about 100 GHz. In addition, bandwidths of 300 GHz and 250 GHz are observed in [22,23]; however, design 7 of this study, as shown in Table 2, far exceeds them (∼400 GHz).…”

“…Compact SSPP transmission lines have been designed that do not use the conventional gradient transition for SSPP excitation [22]. Another recent advancement involves the experimental verification of SSPP behaviour beyond 1 THz [23]. Three structures with band-edge frequencies of 0.53 THz, 0.63 THz and 1.04 THz have been designed and transmission characteristics were verified using a terahertz-time-domain spectrometer system.…”

“…Table 2 shows the summary of the proposed design, simulated in the terahertz range. As shown in Table 3, some recent research on SSPP waveguides based on terahertz frequencies [22,23]. In addition, we compared the proposed SSPP design with the research reported in [35][36][37][38][39].…”