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Now showing items 31-40 of 72
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 ...
Optical and electronic properties of doped silicon from 0.1 to 2 THz
(AIP Publishing, 1990-04-23)
Using a source of freely propagating subpicosecond pulses of THz radiation, we have measured the absorption and dispersion of both N- and P-type, 1 ohm-cm silicon from 0.1 to 2 THz. These results give the corresponding ...
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 ...
Adiabatic following model for two-photon transitions: Nonlinear mixing and pulse propagation
(American Physical Society, 1975-12)
Two-photon resonantly enhanced parametric generation processes have generally been described using time-dependent perturbation theory. In this paper we show that a theory of two-photon coherent effects can be used to derive ...
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 ...
Far infrared spectroscopy with subpicosecond electrical pulses on transmission lines
(AIP Publishing, 1987-08-17)
Optically generated and detected electrical pulses on transmission lines in the subpicosecond range have frequencies extending up to 1 THz, thereby covering the far infrared region of the spectrum from 0 to 30 cm^-1. We ...
Time domain terahertz impulse ranging studies
(AIP Publishing, 1995-10-02)
We present time domain impulse scattering measurements of freely propagating terahertz radiation measured with subpicosecond resolution. This fast time response corresponds to a usable bandwidth of over I THz. Measured ...
Line narrowing of terahertz vibrational modes for organic thin polycrystalline films within a parallel plate waveguide
(AIP Publishing, 2006-12-19)
Waveguide terahertz time-domain spectroscopy is used to demonstrate the narrowing of vibrational lines for a thin polycrystalline film of 1,2-dicyanobenzene in a parallel plate metal waveguide. When compared to corresponding ...
Point source terahertz optics
(AIP Publishing, 1988-10-17)
We demonstrate an ultrafast 10 micro-m sized, electric dipole source of terahertz radiation closely coupled to a 1 cm spherical mirror. This optical approach has the advantages of subpicosecond response times with essentially ...
Observation of the formation of an optical intensity shock and wave breaking in the nonlinear propagation of pulses in optical fibers
(American Physical Society, 1989-01-30)
We have observed the formation of an optical intensity shock and the subsequent wave breaking in the nonlinear propagation of 1-psec pulses in an optical fiber. The wave breaking manifests itself as the appearance of ...