Open Conference Systems
Not a member yet
683 research outputs found
Sort by
THz transmission for fixed wireless services under severe weather conditions
No full textTerahertz band systems are expected to be a means of achieving short-range, high-speed communications. However, there are concerns about the effects of rain attenuation and wind-induced vibration, and ensuring performance in adverse weather conditions is an issue. In this presentation, a link budget model of terahertz band fixed wireless systems under storm conditions will be presented and the feasibility of a highly stable system will be discussed
Status and progress of millimeter-wave GaN transistors for next generation high-power radar systems
No full textWith the development of wireless communication such as 5G or SATCOM, the need and requirements for millimeter-wave compact solid-state high power amplification has significantly increased. In this presentation, we will discuss some potential device design enabling to properly operate in the millimeter-wave range under high drain bias > 20 V with high performance
Electromagnetic Asymmetry Enhanced Second-Harmonic Generation in a Symmetry-Broken Plasmonic Nanocavity
No full textPlasmonic particle-on-film nanocavities, comprising metal nanoparticles closely separated from a thin metal film by a nanometric dielectric gap, support hybridized plasmon modes with extremely small mode volume and strongly enhanced local field. In this talk, I will discuss a new mechanism for second-harmonic generation (SHG) enhancement in single symmetry-broken plasmonic nanocavities, i.e., the light-induced electromagnetic asymmetry
Non-Hermitian THz metasurfaces based ultra-sensitive sensing
No full textSince the sensitivity around EPs is significantly enhanced, Non-Hermitian photonics has become an emerging research area that has been extensively studied in different spectral regions using various optical systems. Here, we demonstrate sensing of amyloid-beta (Aβ) protein, a well-known precursor for Alzheimer's disease by an abrupt phase transition near an exceptional point in non-Hermitian¬ metasurfaces
Fabrication of Large-Area Metal Oxide Infrared Metasurfaces
No full textWe present recent developments for the fabrication of functional metasurfaces in the mid- and long-wave infrared using 200mm wafer scale nanofabrication techniques. Our results include deep-UV scanner lithography of multi-band metasurfaces with tailored reflectivities in the two atmospheric windows. Also we will show recent results on smart radiative cooling metasurfaces based on atomic layer deposition of W:VO2
Field- and Carrier-Enabled Nonlinear Nanophotonics
No full textThe active manipulation of optical properties via external stimuli and the nonlinear wave-mixing of light with controlled means are among compelling research directions in nanophotonics. In this talk, we explore active and nonlinear plasmonic metamaterials by leveraging the field-induced disruption of the inversion symmetry for second-order optical processes, and exploiting the hot-carrier-induced perturbation in structured optical media for ultrafast all-optical modulation and nonlinear signal generation
Quantum photonics using nanodiamonds and integrated optics
No full textWe will present our recent work on integrated quantum photonics based on a hybrid system made of colour centres in nanodiamonds and single photons within a common optical bus. This platform is a first step towards scalability for quantum communications. Ultimately, we aim to achieve entanglement via the interaction between two nodes thanks to a common photonics waveguide
Optoinduced magnetization from the spin and orbital angular momenta of light
No full textWe provide a spin and orbital angular momentum representation of the inverse Faraday effect in a metal. We analytically show the role of the spin and orbital angular momenta of light, as well as the spin-orbit interaction (SOI), in the generation of an optoinduced magnetization. We also show that resonances in plasmonic nanoantennas enhance and confine the IFE, thereby leading to static magnetic fields directly applicable in a vast application domain including all-optical magnetization switching and spin-wave excitation
Enhancement of Light Emission Using ZnO Grating Nanowires: An Experimental and Numerical Study
No full textWhite Light Emitting Diodes (WLEDs) with improved light emission in the red region are highly desired for many applications especially for obtaining warm illumination. In this work, we provide an experimental and theoretical study for a grating structure composed of ZnO nanowires (NWs) that proves to boost and directionally extract the visible and red light emission. The experimental results are compared with a theoretical and numerical model to understand this unique optical behavior
Guidance and Radiation of Metasurface-Waves
No full textMetasurfaces constitute a class of thin metamaterials, which can be used from microwave to optical frequencies to create new electromagnetic engineering devices. At microwave frequencies, they are obtained by a dense periodic texture of small elements printed on a grounded slab