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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 ...
Measurement and noise characterization of optically induced index changes using THz interferometry
(AIP Publishing, 2004-05-24)
A Michelson interferometer designed for broadband single-cycle THz pulses is used to characterize optically induced index changes in semiconductors which result in submicron changes in optical path length. The interferometric ...
Optical tunneling of single-cycle terahertz bandwidth pulses
(American Physical Society, 2001-08-27)
We report time-domain measurements with subpicosecond resolution of optical tunneling of terahertz electromagnetic pulses undergoing frustrated total internal reflection. Measurements of the transmitted electromagnetic ...
Time resolved synthetic aperture terahertz impulse imaging
(AIP Publishing, 2001-12-31)
Using a well characterized terahertz (THz) impulse ranging system we demonstrate broad bandwidth imaging at THz frequencies using an inverse synthetic aperture deconvolution technique. The system demonstrates millimeter ...
Part-per-million gas detection from long-baseline THz spectroscopy
(AIP Publishing, 2004-09-13)
We report a long-baseline THz time domain spectrometer based on a White cell design capable of detecting gas species in the low part-per-million range in near real time. Coherent transients from methyl chloride vapor are ...
Properties of surface waves determined via bistatic terahertz impulse ranging
(AIP Publishing, 2001-02-19)
A bistatic terahertz impulse ranging system has permitted the full isolation and direct measurements of the surface wave loss and dispersion for terahertz frequencies on a dielectric cylinder. This system permits ranging ...
Characterization of thin polymer films using terahertz time-domain interferometry
(AIP Publishing, 2001-08-06)
An interferometer for broadband single-cycle THz pulses is developed based on the Michelson configuration. Total internal reflection of THz pulses in high-resistivity silicon prisms provides a nearly 180° phase shift of ...