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Photothermal effects in nanostructures: from ultrafast optical symmetry breaking to extreme heat dissipation
No full textI will show how this phenomenon leads to a space-dependent out-of-equilibrium hot carrier population that breaks the optical symmetry of otherwise symmetrical nanostructures. The resulting asymmetric hot-carrier time dynamics can be exploited to manipulate light-matter interaction in the ultrafast regime. Electron-phonon scattering eventually induces heating, and I will show how properly designed large scale ultrathin (~250nm) metasurfaces allow extremely large (~GW/m3) and broadband (~90% of solar spectrum) dissipated power densities.  Â
Machine learning enabled wearables for plants and humans at nano scale
No full textThe objective of this tutorial is to present the opportunities, challenges, and recent advancements of this new and growing inter-disciplinary field explicitly in healthcare and agricultural technology domains using terahertz frequencies
A Biomedical Implantable Patch Antenna with X-shaped slot for Wireless Communication Networks
No full textThis study presents an Industrial, Scientific, and Medical (ISM) band at 915 MHz. There are four slotted resonators in this patch, which are installed on a flexible Roger Duroid RT5880 substrate with a typical 0.254 mm thickness. The suggested antenna's overall dimensions are 7mm x 7mm x 0.254 mm, and it spans a frequency range of 800 MHz to 1 GHz (200 MHz) under the skin tissue
Microstrip Antenna Array Design for UAV Detection
No full textThis work presents the design and realization of four linear arrays of microstrip rectangular patch antennas. This linear array is one of the elements of a passive radar using signals from 4G base stations for UAV detection. The arrays have been validated and operate from 2.62 GHz to 2.69 GHz, with a HPBW of 82° in H-plane and a maximal gain going from 11.1 dB to 12.2 dB in the required bandwidth, with a cosecant squared pattern in the E-plane
Wideband Printed Planar Monopole Antenna Element for Wearable Application
No full textThe implementation of a wideband printed monopole antenna near a metallic shield is presented. A wearable antenna system application to probe the electromagnetic field, with frequency in the range 0.7-3.5 GHz (5:1 bandwidth), incident on a professional user is envisaged. A lossy foam layer is used between the shield and the antenna to absorb the shield reflection and avoid narrowing the bandwidth
Interplay between nonlinear effects at the nanoscale in engineered optical nanoantennas
No full textNnanostructures can be exploited to enhance nonlinear optical processes via the strong light confinement by their resonant modes. The dependence of these modes on the geometry and material composition offers ample opportunities for tailoring the optical response of the system. I report about sum-frequency generation (SFG) by individual dielectric and plasmonic nanocylinders, pumped by two pulsed beams with different photon energies. A rich size- and polarization-dependent behavior is observed, disclosing strategies to manipulate the nonlinear properties of nanoscale system
PIFA Multi-layers for smart watch application in the 2.4 GHz for the Bluetooth Low Energy BLE
No full textThis paper presents a Planar Inverted-F Antenna (PIFA) design for a smartwatch application, optimized to operate on the 2.4 GHz Bluetooth frequency band, on the proximity of the human forearm. . By a multi-layer substrate, half air half rubber we obtain a return loss of –20 dB is obtained at 2.4 GHz, and an efficiency of -5 dB, which represents a good efficiency taking into account the effect of the human forearm
Integrated single photons sources based on tapered optical nanofibers
No full textWe present the optical and quantum properties of highly efficient perovskite nanocubes and discuss our strategy towards a compact integrated single photon source
Design and Characterization of Compact Aspen Shape Multi-Element Antenna with Isolation Improvement for SWB Applications
No full textFour element Aspen modeled MIMO antenna printed on Rogers RTÂ Duroid 5880â„¢ substrate and its compact size is 20mm x 23mm. The proposed antenna produce operating bandwidth of 23.66GHz (4.12 to 27.78GHz) and FBW is 148.33%. Proposed antenna has isolation greater than -20dB in the operating SWB and VSWR is less than threshold value 2 in the obtained SWB range. Peak gains at selected frequencies 4.8GHz, 8GHz, 14.1GHz, 16.2GHz and 23.6GHz are 3.16dBi, 5.19dBi, 5.82dBi, 5.13dBi and 6.98dBi respectively
Large Aperture Metasurface Antennas to Enable Rapid-Revisit, Satellite-Based Synthetic Aperture Radar
No full textWe present the case for waveguide-fed, metasurface apertures as spaceborne antennas for synthetic aperture radar (SAR) imaging. Remote surveillance of earth has gained increasing relevance, both for military as well as commercial purposes. Low- and mid-frequency microwaves have the advantage of penetrating clouds and possibly other obstructions, enabling the capability to persistently monitor terrestrial targets