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Generating topological states with non-Hermiticity and symmetry breaking
No full textWe present our recent theoretical and experimental works regarding ways to generate photonic topological states in photonic crystals, by breaking the crystal symmetry, with adding phase-change materials / non-Hermitian periodic modulation. We also show various interplays of polarization singular points and exceptional points in non-Hermitian photonic crystals, leading to interesting chiral properties
Hybrid Photonic Crystal lasers for Refractive index Sensing
No full textWe present results on a novel design of high Q-factor Silicon Nitride (SiN) 1D Photonic Crystal (PhC) cavities side-coupled to curved waveguides, operating with both silica and air cladding, which we then employ in a Hybrid External Cavity Laser (HECL) configuration. We demonstrate the operation of these lasers as novel transducers for refractive index changes that are induced by analyte specific absorption of infrared radiation by the target analytes present in gas or liquid phase
A fast hybrid approach to model roughness effects for 2D the tropospheric maritime long-range propagation
No full textThis paper studies the long-range tropospheric electromagnetic wave propagation over the sea. An asymptotic model based on the parabolic wave equation is considered. This latter is solved using a fast and memory-efficient wavelet-based method. The roughness effects of the sea are introduced through a hybrid approach. Numerical experiments (in X-band) are provided to highlight the advantages of the wavelet-based method in the context of maritime propagation
Target DOA Estimation using GLRT and Crosstalk Reduction for MIMO Radar
No full textMultiple-Input Multiple-Output (MIMO) radars withcolocated antennas have been shown to have higherresolution and better accuracy in target localization thanstandard phased-array radars. However, due to theproximity of the antenna elements, direct coupling betweenthe transmitters and the receivers (crosstalk) may exist anddegrade in the narrowband case the performance of somedetection techniques, such as the Generalized LikelihoodRatio Test (GLRT) based one. This paper presents acrosstalk reduction technique for MIMO radar
Assessment of Electromagnetic Field Threats to a Military Airport
No full textA recent area of concern is how to insure the continued functioning of critical elements of societal infrastructure amid increasing forms of terrorist activities. One new threat is the use of an HPEM source to create intentional electromagnetic interference (IEMI). This threat involves deliberately illuminating a facility or sub-system with a sufficiently intense EM field, to cause an interruption in the normal operation of the facility’s electrical equipment
Beam Forming ARMA for Electronic War Applications
No full textThis paper deals with 2 methods, allowing to fous the radiated field of the radiated field of an ARMA, for electronic war application the field strenghening is obtained without having to increase the input power. It can be done through simple bending of the antenna or applying a specific phase law
Light induced exotic chiral surface reliefs in azo-polymers
No full textWe review the formation of exotic chiral surface reliefs of azo-polymers by irradiation of structured light beams with optical angular momentum, that is orbital and spin angular momentum. Such chiral surface relief will be applied to be advanced chiral metasurfaces
Metaoptics for Active Photonics
No full textMetaoptics offer unique opportunities for light control through dispersion engineering and optical nonlinearities. Here we demonstrate ultrashort pulse shaping with metasurfaces and new schemes for spatial light modulation and Gigahertz speed transmission modulation based on Mie resonances and on organic layers with giant electrooptic coefficient.  Â
Software-defined reconfigurable metasurfaces for programmable wireless environments
No full textProgrammable reconfigurable metasurfaces are expected to constitute a key element in the future programmable wireless environments. Here we discuss the design and fabrication of a programmable, reconfigurable and multifunctional metasurface able to operate as all-angle perfect absorber, beam steering and beam focusing device, accounting also for all aspects imposed by the programmability incorporation
Reconfigurable Intelligent Surfaces for Future Wireless Communication
No full textA novel idea of a smart reflector that is gaining a lot of interest is the Reconfigurable Intelligent Surface (RIS) which operates by reflecting the waves in the same way as a backscattering device. It consists of planar, low cost, nearly passive elements that would smartly manipulate EM waves in specific directions. In this talk, I will discuss about the work on this topic in our group and different testbeds and their results