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We present experimental and theoretical investigations on the THz wave generation and detection using ambient air or selected gases as the THz emitter and sensor, as well as the potential applications of THz air photonics.
Terahertz wave generation and detection using air as both the terahertz wave emitter and sensor media through nonlinear optical processes similar to four-wave mixing (named terahertz air photonics) were introduced. Due to the unique features of this technique, it is possible to find applications for terahertz air photonics in remote sensing and identification of explosives by sending optical beams...
We report an experimental study of the reflection of s- and p-polarized subpicosecond THz-radiation pulses from silicon. We propose silicon reflection switches for electron bunch length measurement via THz wake field diagnostics.
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 observe that n-GaAs terahertz emitters with as-grown Be-doped low-temperature-grown (LTG)-GaAs layers exhibits greater radiation power than devices with or without undoped LTG-GaAs layers and explain it by the enhanced electric field in the surface depletion layer.
Summary form only given. To date, the measurement of terahertz pulse is primarily being carried out using ultrafast photoconductive antennas and far-infrared interferometric techniques. In this presentation, we report our recent work on ultrafast electro-optic field sensors for the coherent measurement of freely-propagating THz beams. The sensitivity of our ultra-wideband field sensors is improved...
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