Abstract
We report experimental investigations in which quasi-optical methods were
used to efficiently couple freely propagating, optoelectronically generated,
subpicosecond pulses of terahertz (THz) radiation into submillimeter circular
metal tubes (waveguides) and, consequently, to measure the transmitted pulses
from these waveguides. We observe very dispersive low-loss propagation over
the frequency band from 0.65 to 3.5 THz, with frequency-dependent
group velocities ranging from to and phase velocities from to , where . The linearly polarized incoming THz pulses couple significantly
only into the , , and modes of the utilized 24- and 4-mm-long stainless-steel tubes,
with inside diameters of 240 and , respectively.
© 1999 Optical Society of America
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