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By “seeing” the fluorescence or “hearing” the sound emitted by plasma, coherent detection of broadband THz waves by laser-induced plasma at standoff distance is feasible. We will report these recent developments in THz wave sensing with air-plasma photonics.
We present an “all-opticall” technique of broadband terahertz wave remote sensing by coherently manipulation of fluorescence from asymmetrically ionized gases. Coherent THz wave detection at a distance of 10 meters has been demonstrated.
We have designed and fabricated THz detectors based on excitation and rectification of radiation induced overdamped THz plasmons in InGaAs/GaAs HEMT structures. These plasma wave detectors were used to image the beam profile of THz gas laser operating at 1.63 THz with FWHM of 140 ??m. The images were recorded with deep sub-wavelength spatial resolution. This allowed to resolve a sub-wavelength shifts...
We used a commercial neon lamp to detect THz waves (0.1, 0.2, 0.37 THz), IR (800 nm) and UV light (200 ~ 400 nm). The amplified responsivities at 0.1 THz, 0.2 THz, and 0.37 THz are 150 V/W, 57.5 V/W and 19.3 V/W, respectively.
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...
For standoff distance terahertz wave generation by mixing a 800 nm pulse and its second harmonic (400 nm) in air, a phase compensator, incorporated with a small-angle wedge pair, is used to pre-compensate the temporal walk-off between the 800 and 400 nm pulses due to the normal dispersion of the ambient air. With the phase compensator, we are able to generate intense terahertz waves by sending the...
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