Rotated Pillars for Functional Integrated On-Chip Terahertz Spoof Surface-Plasmon-Polariton Devices

Spoof surface plasmon polaritons (SPPs) with strong subwavelength field confinement and enhancement offer a promising way for realizing integrated on-chip terahertz (THz) devices. How to find a simple way to control the dispersion of spoof SPPs and then achieve functional on-chip devices is thus highly desired. Here, the authors theoretically and experimentally demonstrate that such a method can provide sufficient design degrees of freedom to enable versatile THz spoof SPP metadevices. As a proof-of-concept demonstration, a series of on-chip meta-devices including the switch, the wavelength demultiplexer, and the splitters are presented. The proposed strategy paves a simple way toward the integrated on-chip THz devices with various functionalities.