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Quantum dynamics in structured photonic fields
No full textPhase- and polarization-textured laser pulses have been realized in a wide range of frequencies spanning the XUV to the THz regimes. This contribution presents few examples on how to use these pulses or combination thereof to induce new types of optical quantum transitions and/or laser-dressed states. For instance, it is found that electronic toroidal states can be triggered and controlled on the picosecond time scale using polarization-structured THz vector beams
A New Measurement Configuration for the Microwave Breast Cancer Imaging
No full textIn this paper it will be presented a new microwave measurement configuration for the breast cancer imaging. The system consists of 36 modified Vivaldi antennas located circularly in an alumina matching medium. The operating frequency of the system is 0.4-8Ghz. The imaging system is clinically tested with 322 patients and now in the process of medical certification. During the talk the clinical results will be presented as well
Subwavelength waveguide arrays for spatial phase manipulation of microwaves
No full textWe design, fabricate and experimentally test waveguide arrays with subwavelength width and periodicity to manipulate the spatial phase of microwaves. The electromagnetic performance of the waveguide arrays is optimized by use of a particle swarm algorithm
Advances in the theory of Characteristic Modes
No full textThe Characteristic Mode Theory was developed by Professor Roger F. Harrington and his collaborators, relating currents in the radiating structure to the associated modal fields. It has been extensively developed following the paper published by the authors of this communication, revisiting the theory and applying it to the analysis of planar antennas.  The latest advances in cubesat, planar lens structures, antennas for MIMO applications for 5G applications and metamaterials are presented
Accurate and Efficient Analysis of the Electromagnetic Scattering from a thin disk
No full textAn effective semi-analytical technique for the analysis of the scattering from a thin disk is briefly presented. The problem, formulated as sets of one-dimensional integral equations in the vector Hankel transform domain, is discretized by means of Helmholtz decomposition and Galerkin method with complete sets of orthogonal eigenfunctions of the most singular part of the integral operators, reconstructing the physical behavior of the fields, as expansion bases. In this way, fast-converging Fredholm second-kind matrix equations are obtained
MMW 60 GHz Tunable Periodic Filter
No full textA novel mm-wave periodic filter structure has been proposed based on a new design approach. The filter performs at 60 GHz with 3.5GHz bandwidth. The structure composed of periodic Microstrip stubs on BL037 Liquid Crystal substrate. Changing the bias voltage of LC provides a tunability from 58.5 to 62 GHz, while maintains the fractional bandwidth around 5 %. In addition, the effect of a different LC substrate has been investigated which provides similar behavior with a wider tuning distance.Â
The polariton laser ridge: an exception to the rule
No full textWe present an experimental study of a laser with a ridge waveguide geometry, allowing to show that the polariton laser effect can be observed only by imposing a pumping section of only 15% of the total length of the cavity. A good quantitative agreement between experimental results and simulationsis obtained. We explain how a ridge polariton laser is different from a conventional laser
High-Speed Fiber-Wireless-Fiber Bridge System for Fixed Wireless Link in Millimeter-Wave Band Using Photonic Technology
No full textWe present photonics-enabled technologies to realize high-speed fiber–wireless–fiber bridge systems in the millimeter-wave band, including a photonics-enabled receiver and an all-photonic receiver. In the former method, the millimeter-wave signal is down-converted to the microwave band before being converted to the optical signal for further transmission using an optically generated local oscillator signal. In the latter method, the millimeter-wave signal is directly converted to the optical domain without any frequency conversion using a broadband optical modulator
Electronic and optoelectronic properties of black phosphorous
No full textHerein, we present the enormous capabilities of the most recent rediscovered 2D material named black phosphorous (BP). It offers a solution for several technological limitations that appears in conventional 2D materials such as transition metal dichalcogenides/oxides etc. In the present work, we have demonstrated the electronic and optoelectronic properties of BP via realizing field effect transistors.Â
Towards efficient detection and spectroscopy of photons emitted by Er3+ ions in silicon
No full textWe develop a highly sensitive apparatus for efficient room temperature detection of the emission by Er3+ ions co-implanted with oxygen atoms in a Si substrate. Our setup proves to be capable of detecting a lower bound value for the emission intensity of about 104 photons/s, corresponding to an ion surface concentrations down to 1012 cm-2. Yet, the open challenge we aim here is to retrieve the spectroscopic fingerprint of Er3+ with high resolution at these low concentrations