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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 ...
Time resolved measurements which isolate the mechanisms responsible for terahertz glory scattering from dielectric spheres
(American Physical Society, 1998-01-12)
The surface-wave scattering processes responsible, in part, for the optical glory have never been compared with theoretical predictions. Here, THz impulse ranging is used to measure the time domain impulse response of ...
Experimental time-domain study of THz signals from impulse excitation of a horizontal surface dipole
(AIP Publishing, 1999-03-22)
Using optoelectronic techniques with sub-ps resolution, we have characterized the electric-field time-domain response from an impulsively excited, micron-sized dipole antenna on a dielectric surface. When detected by an ...
Measurements of the THz absorption and dispersion of ZnTe and their relevance to the electro-optic detection of THz radiation
(AIP Publishing, 1999-06-07)
Via THz time-domain spectroscopy, we have measured the absorption and index of refraction of single-crystal (110) ZnTe from 0.3 to 4.5 THz. We find that the absorption is dominated by two lower-frequency phonon lines at ...
Demonstrated low radiative loss of a quadrupole ultrashort electrical pulse propagated on a three strip coplanar transmission line
(AIP Publishing, 1997-11-10)
We present an approach for reducing the absorption and dispersion due to Cherenkov radiation on coplanar transmission lines, which does not require the reduction of the permittivity mismatch between the substrate and the ...