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GaAs-based Blocked-Impurity-Band (BIB) detector, as a potential high-sensitive, low noise Terahertz (THz) detector, has been developed for the broad application in the area of THz security check and astronomy mission. In this work, GaAs:Si and GaAs:Te BIB detectors were fabricated. Their responsivity properties were measured at T=3.5K, under different biases and the same black body temperature of...
Silicon PMTs revolutionized the High Energy Physics instrumentation, first for the Calorimeters. Exploiting the Silicon PM technology and beyond, their pixel structure and avalanche regime, leads to novel tracking techniques, either applied to large area tracking systems or digital 3D avalanche pixel devices.
There is a demand to further improve upon performance parameter of particle detectors for high luminosity applications. Higher breakdown voltage, larger signal, lower leakage current and low noise is the primary requirement for future detectors. We want systematic study and investigate one of the important parameters namely the breakdown voltage and want to achieve optimum result for future detectors...
Spectrum sensing is a method which is used to find out whether the channel is idle or not in Cognitive Radio Network (CRN). Traditional methods are not much reliable due to the uncertain noise during the detection. In this paper, a weighted cooperative spectrum sensing strategy with jointing energy and spectrum-width detection under noise uncertainty is proposed to improve the detection performance...
In the last decade, the research on terahertz imaging systems in CMOS has attracted extensive attention and gained rapid progress. Detection theory and performance indicators are first analyzed in this paper. System structures are then compared from three aspects. Finally, research progresses are reviewed and certain research directions are indicated on account of existing problems.
In this work we present time domain interferometry (TDI) and spectral domain interferometry (SDI) techniques applied to a fiber optic Fizeau interferometer sensor. This class of sensor is capable of measuring parameters such as position, length and vibrations, in the spectral domain with improved resolution by a temporal analysis. In particular, Fourier domain SDI (FD-SDI), is able of measuring absolute...
In this work we show an approximation for the detection and false alarm probabilities of a differential detector with constant false alarm probability, applied to GNSS signal acquisition. Also, a novel performance metric is shown that we believe is an important parameter when designing efficient acquisition strategies for the implementation of GNSS receivers. The work allows for the conclusion that...
Boosted forest (BF) is a commonly used method for object detection. With the help of cascade strategy, it can efficiently reject non-object windows and finally, combined with sliding window paradigm, give the locations of target objects in an image. In the literature, many aspects of cascaded boosted forest (CBF) have been well studied, such as image representation, tree split and cascade structure...
A signal obtained from a combined system of two interferometers of low coherence in the frequency domain is presented and analyzed. This system allows to expand the range of measurement offered by the conventional optical tomography system of a single interferometer with a spectrometer as a detector.
We present a THz heterodyne detector based on a single layer graphene field effect transistor (GFET) integrated with a bowtie antenna at 400 GHz. The heterodyne detection is achieved by coupling RF and LO signals quasi-optically to the same GFET. The down converted IF signal is extracted via a coplanar stripline connected to the GFET source and drain terminals. The measured IF bandwidth is 5 GHz.
We present two terahertz detectors composed of microbolometer sensors (vanadium oxide and silicon pn diode) and metamaterial absorbers monolithically integrated into a complementary metal oxide semiconductor (CMOS) process. The metamaterial absorbers were created using the metal-dielectric-metal layers of a commercial CMOS technology resulting in low-cost terahertz detectors. The scalability of this...
This paper presents a low-cost silicon-based terahertz computed tomography system for industrial volumetric imaging. The THz-CT scanner comprises a single radiator and detector at 490 GHz and a PTFE-lens based optical train that is fixed inside a portable cage system. It features a 2.5 mm resolution limited by the effective lens aperture and offers up to 62 dB SNR in chopped and 38 dB in a continuous-wave...
The sensitivity of state-of-the-art superconducting far-infrared detectors is such that astronomical observations at these wavelengths are limited by photon noise from the astronomical source unless a method of restricting the spectral bandpass is employed. One such method is to use a high resolution Fabry-Pérot interferometer (FPI) in conjunction with a lower resolution, post dispersing system, such...
The design and performance analysis are presented for a passive uncooled radiometer pixel suitable for integration in 28nm CMOS technology. In the configuration a single wideband antenna, operating from 200 GHz to 600 GHz, is connected to a pn-junction diode. Including the antenna-detector impedance mismatch, the detector shows an average NEP of 2.71 pW/√Hz such that, together with the antenna, the...
In this paper, we explain the THz detection mechanism in sub-threshold Si MOSFETs by exploiting the exponential dependence of channel electron density to the gate-source voltage. According to our theory, this high frequency non-linear dependence is the underlying mechanism for rectification of THz radiation. The maximum detection frequency is limited by dielectric relaxation time of the electrons...
This paper describes general considerations for the design of highly efficient and distributed room-temperature Terahertz detectors and transmitters in (Bi)CMOS technologies. It discusses the design of industrial-grade scalable terahertz imaging systems. This necessitates a deep understanding of the process technologies front-end and the back-end, as well employing innovative architectures of terahertz...
THz radiation can couple in various undesired ways to THz detectors, e.g. through wires or contact pads, aggravating calculation of sensible values for the device responsivity. We therefore investigate coupling of THz radiation to antenna-less large area field-effect transistors with dimensions in the range of the THz spot size proving that only a very small fraction of power is coupled through the...
We design a T-shape structure reflecting mirror covered a gold thin film on the high-resistivity silicon substrate (ρ=1000 Ω·Cm) for the detector array. The electric field distribution of the T-shape structure is simulated by using finite difference time domain (FDTD) solutions in the frequency range from 300 GHz to 400 GHz. The electric field can be gathered in the central area of the silicon substrate...
We used a 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST) crystal coupled with a Si prism to detect THz pulsed radiation in heterodyne electro-optic sampling scheme. The detection efficiency is higher than that for a DAST crystal without a prism, as well as for a LiNbO3 crystal with a Si prism.
The advancement and use of silicon photo multiplier (SiPM) technology has enabled portable devices for applications such as scintillation detection to be developed. The proposed analogue to digital converter (ADC) architecture and field programmable gate array (FPGA) system configuration advances on analogue signal processing methods, traditionally employed for gamma isotope identification applications...
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