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In the frame of the INFN experiment REDSOX/REDSOX2 and in collaboration with Fondazione Bruno Kessler (FBK), Trento, we are developing trapezoidal-shaped monolithic arrays of Silicon Drift Detector (SDD) cells for low energy X-ray fluorescence (XRF) experiments. The shape of the individual SDD cell must be carefully selected in order to find the optimal compromise between spectroscopic performance...
The detection of fast neutrons by recoiled protons from a plastic scintillator situated very close to the pixel detector Timepix was introduced. The directional sensitivity of the detection was proven when signal generated by the scintillating light collected by silicon photomultipliers (SiPM) was used for triggering and synchronization of the system. In the proposed contribution the technique refines...
The alignment of muon chambers relative to each other and to the inner tracker is crucial to achieve the optimal performance of muon reconstruction at high momentum, in particular the best possible momentum measurement. With the energy and luminosity increase in LHC Run2, the high momentum muons have become more important for the searches of new particles with masses around the TeV scale. The muon...
Ultra-thick and ultra-thin Silicon PIN detectors are specially applied in high particles detections. The corresponding leakage current is investigated. The ultra-thick and ultra-thin gated diodes structures based on high resistivity silicon substrates are fabricated and tested to analyses the reverse leakage current for silicon PIN detectors application. It is concluded that the contribution of the...
III-nitride nanowires and disk-in-nanowire heterostructures grown on silicon substrates have been used to realize light emitting diodes (LEDs) [1, 2] and diode lasers [3, 4]. We have recently demonstrated edge-emitting disk-in-nanowire diode lasers, in which the gain region consists of multiple InxGa1−xN (0.3≤×≤0.85)/GaN disks and the emission wavelength varied in the range of 0.53 to 1.2 μm [4]....
We present the design of a novel 8 channels system for time resolved optical tomography based on Silicon Photomultipliers (SiPMs), therefore knocking down cost and complexity of this technique and paving the way to a widespread diffusion. We validated the system performances on phantoms.
In this paper, we report the feasibility of handheld systems that can both sample gas for further laboratory analysis as well as provide first field analysis by gas chromatography. In particular the systems include micro silicon preconcentrator chips that enable concentration of Volatile Organic Compounds (VOCs) by a factor of 1000 for sampling durations smaller than 1 minute, as well as micro silicon...
We have fabricated MEMS infrared thermopiles from a silicon-on-insulator substrate where the buried oxide layer was used to form a membrane for thermal isolation of the detection area. The silicon wires of the thermocouples were patterned with a phononic crystal structure that consisted of 200nm holes on a 400nm pitch. The silicon was degenerately doped using a spin on dopant process to create the...
We examine array configuration and silicon-lens integration of asymmetric-dual-grating-gate high-electron-mobility transistors (A-DGG HEMTs) as plasmonic terahertz detectors in order to enhance their external coupling efficiencies. We demonstrate 4-fold enhancement of the efficiency by an array of four series-connected detectors and 6-fold enhancement by the hyper-hemispherical silicon-lens integration...
VOx microbolometer, which is coupled with thin-film spiral antenna, was fabricated on a Si3N4/SiO2 membrane by metal-organic decomposition (MOD). The DC sensitivity of the device was 3120 W−1 and this value is about two orders of magnitude higher than that of the Bi bolometer fabricated on a dielectric substrate. The responsivity of the device was 370 V/W at 190 GHz for Ib = 50 μA.
We present an antenna-coupled 1 × 64 Nb5N6 microbolometer array detectors for real-time terahertz (THz) imaging. The intrinsic average responsivity of the detectors in the array is 650 V/W, and the corresponding noise equivalent power (NEP) is 17 pW/√Hz. The array chip is combined with a low noise readout circuit with 64 channels. The array detector was preliminary used for THz source imaging, and...
The sensitive and fast response of infrared (IR) detectors exploiting the pyroelectric effect in semiconducting and amorphous Y-Ba-Cu-O (a-YBCO) has been previously reported. We are proposing an analytical model that explains the very fast response of those devices, i.e. 2 to 4 orders of magnitude faster than the regular pyroelectric detectors, while keeping a competitive sensitivity in terms of IR...
Colloidal quantum dots (QDs) have been considered in the last years as a promising material for photodetectors due to size-tunable optical absorption spectra through quantum size effect. Another important advantage is solution processability that facilitates integration on a large variety of substrates, including silicon. This paper presents a hybrid PbS/silicon device prepared from solution-processed...
This paper presents a high responsivity THz detector formed of two depletion mode pseudomorphic high electron mobility transistors (D-pHEMT) coupled to an on-chip bowtie antenna in GaAs 130 nm technology. The measured absolute responsivity of the integrated detector is 10 V/W at 250 GHz at a gate bias voltage of −0.3 V. A silicon lens attached to the GaAs substrate improves the responsivity of the...
This paper reports on a measurement which shows for the very first time that uncooled non-quasi static detectors with wide bandwidth integrated in a 32 × 32 pixel focal plane array in standard 65 nm bulk CMOS silicon technology are able to detect non-amplified black-body radiation. With its integrated readout electronics, this “THz camera” shows a noise equivalent temperature difference (NETD) of...
In this paper we demonstrate the potential use of a germanium p-i-n diode, available without additional processing effort in a photonic BiCMOS technology, for electronic applications. A cut-off frequency above 400 GHz was obtained by S-parameter measurements without any certain design optimization of the diode. The device construction on SOI yields in the isolation of the diode from the substrate...
Fully autonomous navigation of unmanned vehicles, without relying on pre-installed tags or markers, still remains a challenge for GPS-denied areas and complex indoor environments. Doors are important for navigation as the entry/exit points. A novel approach is proposed to autonomously detect™ doorways by using the Project Tango platform. We first detect the candidate door openings from the 3D point...
We present a novel descriptor algorithm (DUDE) using line/point duality and a randomization strategy that provides simple but robust, consistent feature extraction and correspondence. Using duality enables us to effectively capture a distribution of line segments, and the proposed randomization strategy improves repeatability over existing techniques by generating more line features in common between...
We experimentally verify that the low external responsivity of nanostructured asymmetric-dual-grating-gate high-electron-mobility transistors (A-DGG HEMTs) as plasmonic terahertz detectors developed so far is attributed to their low external coupling efficiency. We separately demonstrate (1) 4-fold enhancement of the efficiency by an array of series-connected 4×1 detectors due to the increase in the...
This paper presents a compact antenna-sensor interrogator for pressure sensing. A Frequency Modulated Continue Wave (FMCW) generator was developed to detect antenna-sensor's resonant frequency, which encodes the pressure information. The power consumption of this generator is less than 160mW and can be powered by a 3.7V portable lithium battery. In the paper, the operation principle of this FMCW interrogator...
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