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Numerical and experimental demonstrations are presented to reduce the distortion induced by intense terahertz field in a cross-polarized terahertz time-domain spectroscopy system. A quarter-wave plate is used to increase the initial birefringence of the probe beam. With an optimized angle, the distortion can be removed effectively, while the signal-to-noise ratio of the system is also improved.
We present a novel approach in designing high-throughput high-resolution apertureless near-field scanning probes with enhanced nanofocusing based on graphene plasmonics. Extremely localized plasmons on graphene are mingled with nanofocusing of surface plasmon polaritons to confine and steer the plasmon waves into the apex of a near-field scanning optical microscopy tip. The Fermi level, localized...
This paper describes a passive periodic comb reflection frequency selective surface (CR-FSS) which enables deployment of several high capacity Wi-Fi nodes in a small office scenario by reducing potential interference between each. The CR-FSS is designed to reduce transmission between adjacent access points down a corridor by reducing the forward scatter, and redirecting it as backscatter. The surface...
This paper gives an overview of the ongoing activities in the frame of the EurAPP [1] working group on antennas measurements and the first considerations on useful criteria for comparing and evaluating large amount of measured antenna data. This work comes from the experience acquired during the VI EU Framework network “Antenna Centre of Excellence (ACE) [2]” as reported in [3–9]. During that project,...
Characteristics of electrically small loop antennas were measured by different techniques and the results were compared in-between. The techniques employed were: a single-probe spherical near-field technique, a multi-probe spherical near-field technique, a reverberation chamber, and a Wheeler cap technique. The results were compared with regard to the measurement accuracy, measurement speed, and applicability...
Depth-resolved cathodoluminescence spectroscopy (DRCLS) is a powerful technique for probing the nature of defects in oxides, both electronically and spatially on a nanometer scales. The information derived from this technique provides a tool to guide the growth and processing of state-of-the-art semiconductors and dielectrics for micro and opto-electronics. DRCLS is particularly effective in probing...
This paper presents the design of an ortho-mode transducer (OMT) to separate two orthogonal linearly polarized signals traveling in a circular waveguide with frequency channels at 150/255 GHz band. Simulations (in HFSS) are presented to determine the optimal probe geometry and feed impedance to achieve good coupling to the optimized probes over a wide bandwidth with corresponding feed impedances for...
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