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In the FP7 project CONSORTIS, a dual-band passive imager is being developed for security applications. The latter is based on bolometer based kinetic inductance detectors operating at two frequency bands to improve the collection of thermal information. These bolometric detectors rely on a frequency selective absorber (FSA) to achieve the two bands. In this contribution, we describe the optimization...
We device plasmonic, bolometric and thermoelectric antenna-coupled Terahertz photodetectors based on black phosphorus and hybrid van der Walls heterostructures, showing 20000 signal to noise ratios and 100pW/Hz1/2 noise equivalent powers in the 0.3–3 THz frequency range.
We discuss the improved performance of a microfluidic cell for chemical detection. The sensitivity is increased by placing the microfluidic cell in photonic crystal cavity. The insecticide methomyl is used as an exemplary chemical.
This paper investigates the limit of detection of the spectral fingerprints of a material to be identified by terahertz spectroscopy, when the material is bare or concealed by clothes. After a theoretical study to determine the minimum observable peak amplitude versus the refractive index and the coefficient of absorption of the sample material, we discuss the case of detecting the absorption peaks...
We report on the tuning of the mid-infrared synchrotron radiation toward optimal conditions in nano-FTIR spectroscopy. The electron bunch shape and spectral bandwidth of the emitted radiation are adapted for both strong and temporally stable near-field signal amplitudes.
Millimeter wave sensing systems suffer from measurement inaccuracies when the waist of the radiated beam is relatively larger than the size of the test targets. In order to mitigate the issue, we designed a quasi-optical lens system, which enhances the dynamic range and sensitivity of the millimeter wave sensor system, compared with lens-less sensor systems.
The fast label-free detections of the extent and degree of cerebral ischemia have been the difficulties and hotspots for precise and accurate neurosurgery. We experimentally demonstrated the terahertz (THz) transmission imaging of the fresh cerebral tissues at different ischemic stages within 24 hours. With a CO2 laser pumped continuous-wave THz imaging system operating at 2.52 THz, THz imaging could...
A Fermi-level managed barrier diode was integrated with a current-input pre-amplifier to achieve broadband and low noise THz-wave detection. The fabricated quasi-optical module demonstrated signal detection at frequencies from 160 GHz to 1.4 THz. A peak voltage sensitivity as high as 3.2 MV/W was obtained at 300 GHz with a good linearity, wide dynamic range of more than five decades, and very low...
We propose electrical THz detection based on topological insulators which have Dirac electrons. Among them, multi-layered topological insulator system is expected to stack topological interface states and hence enhancement of photo absorption is likely to be realized. GeTe/Sb2Te3 interfacial phase change memory materials (iPCM) were used and THz-induced electrical response was measured. As a result,...
THz uncooled bolometer imaging arrays developed at CEA-LETI provide flexibility both in frequency tuning and in specific features like polarimetry or multispectral detection. A complete design toolbox has been developed in order to optimize the performance and customize the pixel design for new applications. This paper describes this toolbox, validation modelling and experimental tests.
Measurements of dehydrated cornea and biological fluids are carried out in the THz frequency range. The measured data is used for the modeling of the cornea tissue. It is shown that the maximal sensitivity of diagnostic system to the cornea hydration value appears in frequency range less than 100 GHz. Since the optimal frequency is also depends on spectral parameters of THz setup we proposed using...
Broadband THz detection technique is required for high precision molecular gas spectroscopy, wireless communications, and so on. In this work, Sensitivities of electrooptic (EO) sampling method for the frequency measurement of continuous-wave terahertz (THz) sources were compared from 0.1 to 3.1 THz. By using a femtosecond fiber laser to gate the EO sampling, we observed beat signals between the harmonics...
Using Attenuated Total Reflection (ATR) imaging technique in the terahertz domain, we demonstrate non-invasive, non-staining real time measurements of cytoplasm leakage during permeabilization of live MDCK cells by saponin at low concentration. The origin of the contrast observed between cells and culture medium is addressed by both experimental and theoretical approaches, and demonstrated to give...
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