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Phase control of THz-wave in multi-port waveguide structure coupled with bull’s-eye antenna
No full textWe have analytically and numerically investigated phase control feature of terahertz wave in a waveguide structure coupled with a bull’s-eye antenna via polarization state of the wave incident to the bull’s-eye antenna. In this presentation, we will introduce the theoretical extension to the multiport waveguide aligned in parallel nearby the tiny hole of the bull’s-eye antenna and show some numerical results
Laser scanners with rotational Risley prisms: A graphical method to determine and study exact scan patterns [Invited]
No full textWe report on a novel, graphical method, using a 3D mechanical design program, CATIA V5R20, to obtain and analyze exact scan patterns or a pair of rotational Risley prisms - in comparison to other scanning modalities, produced by the most common galvanometer laser scanners
All-optical terahertz modulation with an epsilon near-zero material
No full textWe theoretically and experimentally study the THz electromagnetic properties of an undoped-InAs slab whose permittivity is optically modified by a photo-generation process. We show a high modulation of the THz transmission up to 90% from 0.75 to 10 THz at very low pump fluence in the continuous wave regime. We also demonstrate a high-speed transmission modulation rate up to 2 MHz range with a modulated pump
High Sensitivity SSR Based Sensor Used for Permittivity Measurement
No full textThe proposed compact sensor is based on a Split Square Resonator (SRR) to improve the detection. The dimensions of the SRR have been chosen to provide a mutual coupling with a high sensitivity. The material under test (MUT) is placed in the near-field region of the sensor. This design exhibits a high sensitivity close to 58% as the relative permittivity of MUT’s changes from 1 to 10. The proposed sensor can measure the permeability and losses
Tunable Carbon-Based Nanomaterials for THz Applications
No full textIn this work single-walled carbon nanotube tuning properties are studied for phase shifting applications. The dielectric rod waveguide with loaded carbon nanomaterials was experimentally studied in ultra-wide frequency band of 0.1-0.5 THz
Scattering by a dielectric cylinder with arbitrary cross section using Pseudo-spectral Modal Method
No full textWe present a new semi-analytical formulation for diffraction by structured cylinders. A pseudo-spectral modal method is used to solve the Maxwell equations written in curvilinear coordinates. The program is compared with the numerical results obtained with finite element method using Comsol Multiphysics
10 to 40 GHz ultra-wideband magneto-electric phased array
No full textTightly-coupled dipole arrays (TCDA) have been developed based on current-sheet periodic structure to achieve ultra-broadband impedance performance with wide scanning capability. This paper presents an alternative ultra-broadband periodic array using continuous magneto-electric (ME) currents, which can be implemented using radiating slots and horizontal monopoles. The proposed ME array is scalable from sub-6GHz to millimeter-wave and has the advantage of much simpler feed structure and does not require extremely small capacitive gap between radiating elements
Mie resonant diamond nanoantennas for spontaneous light emission
No full textThe size of the hosting particle affects the spontaneous light emission of embedded emitters. Here we study submicron-sized diamond particles containing silicon-vacancy color centers. We measure size-dependent scattering spectra, fluorescence emission rate, and Raman scattering intensity. Obtained results are found to agree with our calculations and demonstrate the potential of Mie resonances in nanoantennas design
The Numerical Results of the Magnetic Behavior of the Thin-layers SFCL
No full textThe performance of superconducting current limiters associating the short-circuit phenomenon depends on the structure of the superconducting material envisaged and on the way of inserting it into the electrical network. Â In this paper, we present some numerical results of the magnetic behavior of superconducting fault current limiters (SFCLs). To describe the relationship between the electric field and the current density inside the thin-film superconductor
Designing Disordered Structures to Manipulate Antenna Radiation
No full textWe derive a simple and efficient method for designing wave--shaping materials composed of dipole scatterers. We apply our theory to design aperiodic metasurfaces that re-structure the radiation from a dipole emitter in many ways. Our proposed technique is relevant to designing metamaterials for a wide class of applications, and has the key benefit of including all interactions within the system of scatterers.   Additionally, we develop a clear physical interpretation of the optimised structure, by extracting `eigen-polarizabilities’ of the system