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On the basis of previous theoretical and experimental investigation there proposed and described the technical decision about examined possibility to do the receiver-frequency-meter-tuner of generators on the Josephson junctions (JJ) working in super wide band. It can be especially convenient for the experimental purposes with new generation structures when radiate power is small and frequency are...
We present a fully-integrated, fiber-coupled transceiver module for THz time domain spectroscopy. The transceiver combines emitter and receiver in a compact, 25 mm housing, which allows for THz reflection measurements under normal incidence. With a bandwidth of 4.5 THz and a peak dynamic range of 70 dB this THz reflection head is a versatile tool for material inspection and non-destructive testing.
A MMIC-based sideband-separating receiver operating 640 GHz is presented. The MMICs are characterized at room temperature and 30 K and the noise temperature is reduced by a factor of 6. The amplifiers are then integrated with a single-sideband receiver which uses discretely packaged MMIC mixers. Single-sideband noise temperatures of less than 800 K are measured from 620 to 660 GHz with sideband rejection...
Using newly developed silicon micromachining technology that enables low-mass and highly integrated receivers, we are developing state-of-the-art terahertz spectrometer instruments for space-based planetary and astrophysics orbiter missions. Our flexible receiver with integrated antenna architecture provides a powerful instrument capability in a light-weight, low-power consuming compact package which...
We applied a recently developed, ultrafast terahertz measurement technique to screen folded cardboard boxes for package inserts. The presence or absence of an enclosed leaflet can be detected unambiguously at sample speeds up to 21 m/s, and for samples with an area overlap up to 60%. The simple, robust measurement setup may pave the way to new applications of terahertz technology for quality control...
Microwave diagnostics will play an increasingly important role in burning plasma fusion energy experiments like ITER and beyond. The Collective Thomson Scattering (CTS) diagnostic to be installed at ITER is an example of such a diagnostic with great potential in present and future experiments. The ITER CTS diagnostic will inject a 1 MW 60 GHz gyrotron beam into the ITER plasma and observe the scattering...
Resonant tunneling diode based transmitters for wireless communication systems in the terahertz frequency range around 300 GHz are investigated. Two possible modulation schemes are investigated to increase the data rate of the transmitter. An error-free data rate of 4 Gbps is achieved using the best modulation scheme and a RTD based receiver.
We report the design, analysis and development of Schottky-based frequency multipliers that will be used in millimetre/sub-millimeter-wave heterodyne receiver payloads. The devices are destined for future space deployment in support of a series of second generation European polar-orbiting satellites (MetOp-SG) that will perform operational meteorology.
In this paper we report the first results of the optical components development and the overall optical design for a wideband receiver to simultaneously cover ALMA bands 2 and 3. Two types of feed horns and OMTs have been designed to couple to the ALMA telescope beam using a modified Fresnel lens. Both types of hardware have been manufactured and tested in a near field beam scanner. The measured beam...
Over the past ten years, several silicon microfabrication techniques have emerged to fabricate components for THz instruments. Our approach focuses on the use of multiple silicon dioxide (SiO2) masks and consecutive silicon etching steps using deep reactive ion etching (DRIE) to create multi-step devices with very fine features. We are reporting here on the fabrication of hydrid couplers and a turnstile...
Scattered millimeter waves entering from the collective Thomson scattering diagnostic at ASDEX Upgrade fusion device are generally elliptically polarized. In order to convert the millimeter waves to linearly polarized waves (required for the detector), birefringent window assemblies (sapphire) have been developed to replace grooved metal mirrors. This allows a significantly more compact receiver design...
In this paper we present 1Gb/s wireless data reception at different sub-THz carrier wave frequencies, using a single quasi-optic Schottky receiver module. The module employs a Log-Spiral broadband antenna patterned on silicon. In this paper we present the performances at carrier wave frequencies ranging from 90 GHz to 330 GHz, demonstrating for the first time the flexibility of the module as versatile...
We present the first demonstration of 100-m distance wireless link at single-channel data rates up to 50 Gbit/s using photonics-based 300-GHz-band coherent transmitter. An error-free transmission has been achieved at 30 Gbit/s with a transmitter power of only −15 dBm with a carrier frequency of 320 GHz.
We have developed a superconducting low noise heterodyne receiver at 3-THz band based on a hot electron bolometer mixer (HEBM) with a phase-locked THz Quantum Cascade Laser (THz-QCL) as a local oscillator for atmospheric or astronomical observations. We have demonstrated gas cell measurement of emission line spectra of methanol [CH3OH] at 3.7-THz band. We have also measured methanol line at 2.07-THz...
Terahertz imaging scheme with simplified single homodyne channel was proposed. To realize the calibration and coherent imaging, a Hilbert transform receiver was employed to recover the quadrature signal and obtain the phase information of the return wave. Proof-of-State experiment at 0.22THz band was performed to verify the effectiveness of the proposed imaging scheme, which may find potential applications...
We present results of experimental study of the gain bandwidth (GBW) of MgB2 hot electron-bolometer (HEB) mixers at 0.1THz and 0.4THz. Antenna integrated 0.25–1.5um2 area devices were made from thin MgB2 films deposited with a custom made HPCVD system. Film as thin as 15–45nm had a Tc from 35K to 40K. The GBW was found to be independent on the bias conditions, the bath temperature, and the LO frequency...
A total of 73 dual polarization superconductor-insulator-superconductor (SIS) receivers for the Atacama Large Millimeter/submillimeter Array (ALMA) have been successfully produced to observe astronomical signals in the 787–950 GHz frequency band. The receivers use two double sideband (DSB) waveguide mixers with Nb/AlOx/Nb tunnel junctions and NbTiN/SiO2/Al microstrip tuning circuits on quartz substrate...
Many scientific applications require greater power from solid-state sources than has previously been available. This paper will describe efforts to increase the power handling of diode based frequency multipliers to meet this need. These efforts include improved thermal management and in-phase power combining. Two examples of new sources will be presented; a 263 GHz source with greater than 100mW...
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