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We characterized the terahertz emission from a thin metal film with quasi-randomly distributed porous nanostructures. Unlike many demonstrated nanostructured metal terahertz sources, the emission is in the forward direction when the laser excitation illuminates the metal film at normal incidence, making its integration in a time-domain terahertz system straightforward. We attribute the generation...
We carried out a theoretical and computation study of optical response of graphene over a wide frequency range, from terahertz to ultraviolet. It is shown that due to the massless Dirac Fermion properties, the optical response of graphene is electrically switchable.
THz radiation has been used to uncover small defects in samples of space shuttle foam. This nondestructive method could help NASA to examine the insulating foam that is applied to each shuttle's fuel tank prior to launch.
Fresnel lenses have a number of attractive properties for pulsed terahertz imaging. We demonstrate tomographic imaging with a Fresnel lens and report progress towards the goal of long range terahertz imaging.
We demonstrate three-dimensional terahertz (THz) holography with the use of the windowed Fourier transformation. The coherent nature of THz time domain spectroscopy allows measurement of the phase and amplitude of the THz wave for holographic imaging.
Two dimensional electro-optic sampling allows a target's scattered terahertz field to be measured. By obtaining multiple projection images we have performed the reconstruction of three dimensional targets with millimeter resolution.
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