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An energy recovery system using a four-stage depressed collector was simulated and designed to improve the overall efficiency of the W-band gyrotron backward wave oscillator (gyro-BWO) in the University of Strathclyde. The spent beam information was exported from the simulation of the gyro-BWO using the 3D PIC code MAGIC. The geometry of the depressed collector was optimized using a genetic algorithm...
Photoconductive switches have been extensively studied in time domain spectroscopy (TDS) as THz sources/ detectors. The commonly used devices consist of metal-semiconductor-metal (MSM) structure where Gallium Arsenide (GaAs) is the active layer. In this work, an approach consisting of using semiconducting single-walled carbon nanotubes (s-SWCNTs) instead is proposed. The pristine results showing the...
Using plasmonic gratings, we have greatly increased the photo-absorbing active area of a photoconductive terahertz emitter, without sacrificing device ultrafast operation. More than 20 times radiation power enhancement was measured when compared to a similar emitter without plasmonic gratings.
It is shown that a continuous wave output power of 0.35 mW at 305 GHz can be generated by photomixing in a low temperature grown GaAs photoconductor using a metallic mirror Fabry-Pérot cavity. The output power is improved by a factor of about 100 as compared to the previous works on GaAs photomixers.
To rectify high frequency AC bias, the characteristics and the structure of asymmetric tunneling metal-insulator-metal (MIM) diode has been studied. Needle like nanometer level electrode structure makes a high probability of electron tunneling due to high electrical field density on the electrode structure. The result enhances the asymmetric characteristic of current-voltage at negative to positive...
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