Characterization of the terahertz near-field output of parallel-plate waveguides
نویسندگان
چکیده
We experimentally characterize the field confinement properties of various parallel-plate waveguide (PPWG) geometries in the terahertz spectral range. In contrast to infinite-width PPWGs with free-space diffraction along the unshielded direction, finite-width (and also tapered) PPWGs showwell-confined THz fields at the output facet. Both the transverse field component, perpendicular to the inside surfaces, and the longitudinal component, parallel to the propagation direction, exhibit strong lateral confinement. We also observe an antisymmetric longitudinal field distribution across the air gap, analogous to the symmetric surface plasmon polaritonmode observed in optical slot waveguides. © 2011 Optical Society of America OCIS codes: 230.7370, 240.6680.
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