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We report on the method that terahertz generation and detection were simultaneously performed via non-collinear optical parametric interaction in a nonlinear crystals using a Si-photodiode. The bandwidth manipulation between broad 3.3 THz and narrow 45GHz bandwidths was demonstrated at single quasi-phase-matching crystal using the position-dependence of the crystal.
We present a systematic analysis of geometry-dependent parasitics for THz sub-harmonic Schottky mixer diodes. In particular, the diode RF power coupling bandwidth has been studied, showing a trade-off between the air-bridge finger length and finger separation for operating frequencies beyond 1 THz.
We report on the analytical capacity analysis of terahertz wireless communications supporting 275–325 GHz frequency band. Our goal in this paper is to provide design guidelines for close proximity links with transmission capacity beyond 100 Gbit/s.
Latest results from a second harmonic gyro-TWA experiment at Strathclyde University are presented. The Ka-band experiment uses a helically corrugated waveguide. Simulations have been performed to predict the amplifier gain and bandwidth. The simulations are compared to laboratory measurements of the cold waveguide dispersion using a new, improved design of polarization converter.
We propose a new concept of THz radiation detector composed of a micro-scale THz antenna coupled to a silicon-based quantum dot. The antenna concentrates the incident THz radiation towards the quantum dot, allowing us to measure the current shift induced on the quantum dot Coulomb Oscillations.
We present characteristics of terahertz pulses generated from GaAs surfaces with disordered nano-pillars under femtosecond laser excitation. Nano-pillars on a GaAs surface decreases (increases) a temporal (spectral) bandwidth of a THz pulse from the surface. The results imply that randomly distributed scattering sites due to the nanostructures make the decay time of photo-carriers short and reduce...
Highly efficient mesa-structured 1.5 µm photoconductive antennas, direct detection without lock-in amplifier, and a voice-coil mirror drive with accurate position sensor are merged to a fast and precise system. A pulse trace of 25 ps is measured every 50 ms, and integration over 15 s results in a superior 75 dB dynamic range and a bandwidth of 5 THz.
Frequency up-conversion has been proved to be very effective in THz generation. Reverse physical process can serve THz detection. Based on our in-house characterization of DAST crystal and previous intense studies of monochromatic THz generation, we propose an ultra-wideband THz detection approach by using frequency up-conversion technique, which may work from around 2 THz, up to 28 THz at room temperature,...
This paper presents a method to perform in the optical domain the correlations required when processing millimeter wave interferometric radiometer signals. The main problem when addressing the design of an interferometric radiometer working at W-band resides on the distribution and correlation of large bandwidth signals acquired by each radiometer receiver. In order to avoid the necessity of baseband...
We have derived analytic expressions of bandwidth limitations of travelling-wave photodetectors (TWPDs) for only-output and both input/output impedance matching cases, without any approximations. Results are effective for design of TWPD for broadband terahertz photomixer.
A high-speed travelling-wave photodetector (TWPD) with an InGaAs absorber was designed and realized. The bandwidth of the TWPD was measured as 210GHz using electro-optic sampling techniques. This kind of device can be used for THz photomixer
We generated an ultrabroadband coherent infrared pulse with 1–200 THz spectral range through an air plasma induced by a hollow-fiber compressed 10-fs, 300-µJ pulse and its second harmonic. Also we coherently detected the infrared pulse up to 100 THz with electro-optic sampling using a 20-µm thick GaSe crystal, proving that the infrared pulse was phase locked.
We demonstrate the phase-locking of a 2.5 THz Quantum Cascade Laser (QCL) to an air-propagating, 6 octaves-spanning, THz Optical Frequency Comb Synthesizer (OFCS). We directly observe the beating signal using a commercial detector, therefore proving that this approach provides a mature metrological tool in the THz region. We show that only a small fraction (<100 nW) of the radiation emitted...
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