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A 340GHz backward wave oscillator (BWO) based on the sine waveguide and pencil electron beam is presented as a novel terahertz radiation source. The particle-in-cell (PIC) simulation results predicts that this device can produce the output power of over 2.7W in the frequency range of 335.8–348.5GHz by utilizing a 20mA pencil beam and adjusting the voltage from 12kV to 14 kV.
Photoluminescence in n-doped GaAs/AlGaAs quantum well nanostructures has been studied experimentally in far-infrared (terahertz) spectral range under interband optical excitation at low lattice temperatures. Luminescence in the near-infrared spectral range related to the optical electron transitions from the donor ground state to the heavy hole subband along with interband electron-hole transitions...
We present a compact, room-temperature, high-power and broadly tunable terahertz source based on a two-section digital distributed feedback laser diode and a plasmonic photomixer. It offers a 3 THz radiation frequency tuning range with a radiation power of 0.45 mW at 1.62 THz.
Low frequency THz radiation is visualized by means of a charged-coupled device designed for optical frequencies and a CMOS sensor. This technological advance opens novel opportunities in THz imaging as it offers smallest pixel size and large chip size at low cost. Furthermore the sensor is insensitivity to background noise and is able to detect radiation of multiple spectral ranges from x-rays to...
Terahertz grapheme surface plasmon polaritons (GSPPs) radiation source excited by electron beam has been presented. Here we show the theoretical analysis and initial experimental results on this kind of terahertz source. The theoretical calculations of greatly enhancement due to GSPPs and wide tunability indicate that this mechanism has huge potential. THz TDS is utilized to obtain conductance of...
A novel design of an optically pumped THz photoconductive source in array configuration is presented. The proposed solution is based on the exploitation of the ultrawide band properties of connected antenna arrays. The photoconductive elements of the array are excited by an array of microlenses which splits and focuses the laser beam onto the active areas of the connected array. An ad-hoc DC biasing...
A method to extract terahertz radiation from surface plasmon polaritons excited in the surface of a uniform graphene structure by an electron beam is presented. A sidewall configuration is proposed to lift the surface plasmon mode to be close to the light line, so that some of its harmonics have chances to go above the light line and become radiative. The harmonics are considered to be excited by...
We report on first results obtained with the use of a new setup for direct passive measurements of the low temperature terahertz emissivity of different materials — metals, superconductors, and others. The setup allows estimating the level of noise originating from the thermal radiation of mirrors in terahertz space missions. This setup also makes it possible to develop the passive terahertz emissivity...
We present a novel large-area photoconductive terahertz emitter based on a 2D plasmonic nano-antenna array and compatible with telecommunication optical wavelengths. We experimentally demonstrate a record-high terahertz radiation power level of 300μW over 0.1–5 THz frequency range.
We demonstrate a simple scattering quantum ratchet operating in terahertz regime. It is based on an asymmetrical quantum tunneling effect in two-dimensional electron gas with Rashba spin-orbit interaction (R2DEG).
Terahertz remote sensing, transmission of terahertz radiation for communication, and other applications which require transport of terahertz radiation at a distance permanently attract great attention. Security, spectroscopy, lidar techniques, and data transmission are areas of interest. Depending on the goals and the environment (atmosphere or space), in different applications the word “remote” can...
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