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Periodic structures used for high power millimetre and sub-millimetre sources that implement relativistic beam — wave interactions have historically involved the implantation of a dielectric layer around the inner wall of the interaction region or a periodic corrugated structure that serves to reduce the velocity of an internal electromagnetic wave. Moving towards the THz regime, the physical dimensions...
The efficiency is one of the most important parameter of single photon detector (SPD). The ideal SPD is expected to have 100% efficiency without false counts (always called dark counts). Improving the efficiency and reducing dark counts are interesting work for both scientific research and practical applications. Superconducting nanowire single photon detector (SNSPD) was intensively developed for...
Giant magnetoresistance (GMR) is a quantum mechanical magnetoresistance effect observed in thin-film structures composed of alternating ferromagnetic and non-magnetic conductive layers. Today GMR has been used in various fields including detecting DNA hybridization and pathogenic microorganism[1], screening diagnostic biomarkers[2], detecting HBV genotypes[3], and so on. NT-proBNP is an established...
Latest development and experimental study of a W-band gyro-TWA with a helically corrugated waveguide and a cusp electron gun are presented. With an input seed signal from an 1.5 W, 90–96 GHz solid state source a gain of 27 dB was measured from the experiment. The bandwidth of the gyro-TWA was measured to be at least 5 GHz.
A five-channel frequency-division multiplexing (FDM) fiber laser sensor array based on multilongitudinal mode fiber lasers (MLMFLs) and beat frequency demodulation was proposed. Detailed theoretical analysis of the FDM principle was also described. The potential application of the MLMFL-based FDM for strain measurement was further experimentally studied. The strain sensitivity of $-$0.92 kHz/ $\mu\varepsilon$...
Micro-reentrant square cavities operating at high order modes have been demonstrated to be a viable solution for the realization of millimeter wave klystrons. However, the excitation of the required high order mode is a challenging task. The realization and measurement of a novel coupler for high order mode cavities is proposed.
Two metamaterial Electromagnetic Band Gap (EBG) concept-based antennas are presented for applications in Body Area Network (BAN). The antennas work in V band at 60 GHz and are realized by means of a woodpile planar and cylindrical structure respectively. These structures are made of low loss alumina and can be manufactured through extrusion free-forming techniques. Both the here presented antennas...
A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE71 mode and the 7th cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the...
Performance optimisation of ultra-long Raman laser links is studied theoretically and experimentally. We observe that it is possible to reduce signal power excursion by adjusting FBG reflectivity without compromising pump efficiency.
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