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Are We Alone? NASA Technologies to Find Life Beyond Earth and Answers to Other Science Questions
No full textFundamental science questions drives the selection of NASA missions. We develop instruments to make measurements that can answer those science questions. In this presentation, we will present an overview of the state of the art instruments that we are currently developing and layout the details of the science questions they will try to answer
Microwave Imaging for Medical Diagnostics
No full textThe talk will briefly introduce the principles of medical microwave imaging (MWI) and then review recent progress from Dr Kosmas’ team on the development and validation of this technique for brain imaging. This will include a study on the impact of using a metasurface to enhance signal penetration as well as a comparison of two-dimensional and three-dimensional tomographic approaches
Generation of tunable order Bessel beams with cascaded metasurfaces
No full textA variorder Bessel beam generator is experimentally demonstrated with two metasurface devices. Two cascading metasurfaces are employed to generate Bessel beams in the terahertz range. The order of generated Bessel beam can be turned by rotating the metasurface. The order of the Bessel beam is changed from zero-order to fourth-order when the rotation angle of metasuface components from 20 degrees to 80 degrees
Terahertz Chip-Scale Systems
No full textIn this talk, we will discuss how new design approaches crosscutting circuits/EM/systems partitions, to open new possibilities in enabling programmability and adaptability in these THz chip technologies including programmable chip-scale THz sensors, THz metasurfaces and spatio-temporal control of THz fields for physical layer security, and how these can enable new applications in sensing, imaging, security and localization
Electromagnetic modelling of Leaf Water Potential under Ultra-Wide Band Microwaves Sensing
No full textNoninvasive microwave sensor of plant that measure leaf concentration water is purposed. It is based on a microstrip structure where the loaded layer is represented by a mathematical model. The leaf is represented with the cellulose Cole-Debye model, that includes freshwater molecules which are simulated with different size to characterize the turgescence and plasmolysis behavior. The concept is validated and compared to Cole-Debye model for different situation of stress leaf, represented by an equivalent dielectric cell over the sensor
Graphene surface magneto-plasmons excited through a magnetostatic biased graphene-strip grating : Semi analytical Approach
No full textWe present an accurate and simple semi analytical model for investigating the magneto-plasmonic response of a 1D subwavelength graphene strip grating under an external static magnetic field when the graphene is considered as an anisotropic layer with atomic thickness. It is based on an effective medium approach (EMA) and a rigorous phase correction. The proposed model is numerically validated and evaluated by comparing the results with those obtained from the PMM method and from methods published in the litterature
Universal light encoders: artificial intelligence hardware for light processing components and integrated systems
No full textIn this invited talk, I will review our recent theoretical and experimental results in the field of Universal Light Encoders (ULE) artificial intelligence (AI) hardware for a new class of flexible ultra-flat components (thickness < 100nm) for high efficiency (close to unitary) vectorial control of light These devices are supported by a layer of “physical†neural network units in suitably engineered optical nanoresonators
Radar Cross Section estimation of a set of randomly distributed dipoles as an application to RFID in a high density context
No full textRandomly distributed RFID tags are modeled by a set of short-circuited half-wave dipoles. Numerical Electromagnetics Code simulator is used for the computation of mono-static radar cross section following the two techniques based on the total field backscattered by the target and the radar equation. Different dipole configurations are studied to highlight the RCS distortion. The radar equation makes it possible to estimate RCS from measurements. The simulation results were found to be in good agreement with the experimental data
Non Conventional Reflectarray and Transmitarray Configurations \\ for Next Generation Applications
No full textReflectarrays (RAs) and transmitarrays (TAs) represent an efficient alternative to reflectors and arrays as high-gain antennas, since they posses nice features making them potentially suitable for several different applications. In view of these, some non-conventional, dielectric-only RA and TA configurations are here discussed
Design of Multiband-Filters for Mobile Radio Applications
No full textIn this paper, a new multi-standard filter with four resonance frequencies is proposed for radio-mobile including GSM/4G LTE, WLAN and 5 G applications. The design and synthesis is resolved using a new formulation of the FDTD method. The metal finite conductivity and thickness are rigorously taken into account. The FDTD computed results are in good agreement with simulated data obtained with CST electromagnetic tool