Kassing R, Rangelow IW, Oesterschulze E, Stuke M (2003) Sensors for scanning probe microscopy. Kantor R, Shvets IV (2003) Measurement of electric-field intensities using scanning near-field microwave microscopy. Gao Y, Wolff I (1997) Measurements of field distributions and scattering parameters in multiconductor structures using an electric field probe: IEEE MTT-S Int. Optik 125:2400ĭutta SK, Vlahacos CP, Steinhauer DE, Thanawalla AS, Feenstra BJ, Wellstood FC, Anlage SM (1999) Imaging microwave electric fields using a near field scanning microwave microscope. Using this CPW probe on a precision X–Y scanning table, 2D images of micro-strip line have been successfully constructed, indicated that the ratio of the resolution to the wavelength \(R/\lambda\) is around \(0.66\times 10^\) at 1 GHz.Ĭortes R, Coello V, Arriaga R, Elizondo N (2014) Collection mode near-field scanning microwave microscopy. The estimated sensitivity is 30 µV/(V/m). Simulations and measurements results on a micro-strip line have shown that the probe is mainly sensitive to the normal electric field.
We used an oxidized silicon substrate in order to reduce losses in the silicon. To prevent the oxidation problem, we choose gold as the metal structure. The motivation behind the choice of a coplanar line with a pointed end is the fact of having a quasi-TEM propagation mode in order to have the performances of the conventional coaxial probes and secondly to have a compatibility with the integrated circuits for future microwave integrated microscopy. We achieved These electrical probes, based on a combination of coplanar line and the point effect, using the clean room techniques. In this work, we have presented non-conventional planar microwave probe. Improve the spatial resolution of a sensor is often at the expense of sensitivity. The performances of probe are characterized by two quantities: the sensitivity and spatial resolution, related to the geometry of the probe. For each technique, we present advantages, drawbacks and limitations for imaging the internal structure of an object.The near-field measurement is based generally on the use of purely passive miniature sensors, dedicated to the capture of a component of the electromagnetic field. In this paper, after a brief introduction to two dimensional millimeter waves and terahertz imaging we establish the principles of tomography for Terahertz Computed tomography (CT), tomosynthesis (TS), synthetic aperture radar (SAR) and time-of-flight (TOF) terahertz tomography. A tomographic imaging procedure can be used to acquire and to render three-dimensional images in the terahertz frequency range, as in the optical, infrared or X-ray regions of the electromagnetic spectrum. Three-dimensional, transmission-mode imaging is limited to thin samples, due to the absorption of the sample accumulated in the propagation direction. However, these images are often two-dimensional. Terahertz imaging is a well-established technique in various laboratory and industrial applications. more ABSTRACT Terahertz and millimeter waves penetrate various dielectric materials, including plastics, ceramics, crystals, and concrete, allowing terahertz transmission and reflection images to be considered as a new imaging tool complementary to X-Ray or Infrared. Future perspectives are put forward to increase the sensitivity.ĪBSTRACT Terahertz and millimeter waves penetrate various dielectric materials, including plastic. First results at 0.3 THz (and not at the designed frequency of 3 THz, because of limitations in the testing equipment) show a sensitivity of 35 nV/(W/m2) and a limit detection of the E-field of 23 V/m due to a significant amount of noise. The sensitivity and the limit of detection are also evaluated. The time constant of the sensor is measured with THz and optical sources and it is consistent with finite elements simulations. The grid is deposited on a 1.5 mm-radius SiO2 circular membrane. For future work with sub-wavelength resolution, we have also studied the effect of the reduction of the size of the grids on the equivalent resistivity. The design of the grid is based on a theoretical multilayer model using equivalent resistivity and taking into account small diffraction effects. The absorber consists of a metallic grid made of one of the material of the thin film thermocouples. more ABSTRACT In this paper, we present the conception, fabrication and characterization of a room temperature thermopile designed to detect electromagnetic fields at 3 THz.
ABSTRACT In this paper, we present the conception, fabrication and characterization of a room tem.
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