Multifaceted terahertz applications of parallel-plate waveguide: TE1 mode (Terahertz Technology)

Presented is a review of recent work by the authors in which the lowest-order transverse-electric (TE1) mode of a parallel-plate waveguide (PPWG) is used for terahertz (THz) applications. This work adds a new dimension to the multitude of diverse THz applications made possible by PPWGs. Using the TE1 mode, demonstration is presented of an ultra-low loss THz waveguide, a highly sensitive microfluidic sensor, a whispering-gallery mode waveguide, and an artificial dielectric with an effective refractive index less than unity.