Terahertz plasmonic waveguides based on a microstructure of metal rod array

Metal rod array (MRA) are presented as the microstructured cladding of a rectangle channel waveguide to guide terahertz (THz) waves. The microstructure cladding is critical to modify the waveguide loss, dispersion, resonance, and pass-band. THz-field resonance and the corresponding modal field are taken as examples to express that the MRA period can be tailored for engineering the waveguide. MRA is agreed as a plasmonic metalmaterial, possessing spoof plasma frequency and dependent on the MRA geometry. The case of THz-field resonance inside the waveguide channel is significant to mimic “plasmonic resonance” in THz region that does not appear in natural metals.