The transition from a TEM-like mode to a plasmonic mode in finite-width THz parallel-plate waveguides

摘要

By the near-field measurement of the electric field distribution inside the finite width THz parallel plate waveguide, we find the transition from conventional diffractive TEM-like mode to plasmonic mode. This mode transition depends on the geometry of the waveguide. The measurement is conducted on THz-TDS system with scattering probe-technique. We present the simulation which agrees with our experimental data