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We have performed terahertz (THz) spectroscopy to detect ultrafast motion of a single atom in a single endohedral metallofullerene Ce@C82 molecule. Using the source and drain electrodes separated by a sub-nm gap, we focus THz radiation onto a single Ce@C82 molecule trapped by the nanogap electrodes. When the molecule is illuminated with THz radiation, THz-induced photocurrent is observed. We explain...
We present optimized THz detectors based on AlGaN/GaN field-effect transistors with integrated broadband bow-tie antennas (bow-tie TeraFETs). Designed with a comprehensive circuit model and fabricated with a recently developed AlGaN/GaN MMIC process, the devices reach a performance at room temperature which hitherto has only been achieved with Si CMOS TeraFETs. Capable of broadband detection from...
In this paper, a patch antenna designed to operate in a UHF passive radar with a broadband about 19% is validated in a real semi-urban scenario. Novel techniques, such as using air gap as substrate and E shaped patch, were considered in the fabrication. The proposed solution is used in the surveillance acquisition system of IDEPAR demonstrator, a DVB-T based passive radar system, to evaluate the detection...
Ultrafast photoconductive switches were fabricated from GaAs embedded with ErAs nanoparticles and tested in two antenna types: a self-complementary square spiral, and a slot antenna designed for half-wave resonance at 567 GHz. These devices are designed for driving with 1550nm lasers. At least ∼46 μW of THz average power was generated from the spiral, and ∼5 μW from the resonant slot. This is the...
We have developed an array of GaN-based double-field-effect transistors coupled to double-split-ring resonators, creating an active metasurface. This approach allows for high performance, broadband terahertz detection at room temperature.
DESHIMA (Deep Spectroscopic High-redshift Mapper) is an instrument aiming at efficiently making spectroscopic redshift measurements of sub-mm wave galaxies (SMGs), thereby providing about the formation and the evolution of stars and galaxies. The aim of this work is to provide a preliminary study into the design of a wideband leaky lens antenna coupled quasi-optical system within a 1:3 bandwidth....
A fully-electronic high-speed transmission with a highly-integrated set of quadrature direct-conversion TX and RX modules in 130nm SiGe HBT technology operating in the 240 GHz transmission window is presented. In view of high packaging costs of the currently available THz communication front-ends, each of the modules is implemented as a single chip with a broadband silicon lens-integrated on-chip...
Laser-free 0.03–1.1 THz signal generation and radiation in silicon is presented based on an oscillator-free direct digital-to-impulse architecture that is capable of generating and radiating pulses with a FWHM of 1.9 ps and a 3dB-BW of 130 GHz centered at 160 GHz. A peak pulse radiated power of 2.6 mW and a peak pulse EIRP of 19.2 dBm are achieved. To suppress ringing after the impulse and increase...
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