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Direct observation of the Gouy phase shift in THz impulse ranging
(AIP Publishing, 2000-02-07)
Here we present a direct observation of the Gouy effect through THz impulse scattering from cylindrical and spherical targets. A pi/2 Gouy phase shift through a one-axis focus compared to the more common pi phase shift of ...
Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers
(AIP Publishing, 2000-04-10)
Waveguide propagation of sub-ps terahertz pulses in single-crystal sapphire fibers is reported. An incident THz pulse of approximately 0.6 ps duration undergoes considerable reshaping due to the absorptive and dispersive ...
Electrical characterization of conducting polypyrrole by THz time-domain spectroscopy
(AIP Publishing, 2000-10-16)
Using an optoelectronic THz beam system for THz time-domain spectroscopy (THz TDS), we have measured the absorption and index of refraction of a conducting polypyrrole film from low frequencies to 2.5 THz. From these ...
Plastic ribbon THz waveguides
(AIP Publishing, 2000-10-01)
We report an experimental and theoretical study of single mode, guided wave propagation in plastic ribbons. Using cylindrical THz optics, we obtain excellent quasioptic coupling between freely propagating THz waves and a ...