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Symmetry protected and accidental bound states in the continuum in photonic-crystal structures, studied by the resonant-state expansion
No full textWe apply the resonant-state expansion (RSE), a novel rigorous theoretical method in electrodynamics, to planar photonic-crystal structures, to study their eigenmodes, and in particular bound states in the continuum (BICs). Using the high efficiency of the RSE, we investigate the mode evolution with changes to the geometrical and material parameters of the system. Increasing the amplitude of the periodic modulation of the permittivity, we demonstrate formation of symmetry protected and accidental BICs in photonic-crystal structures and study their properties
Microwave imaging for real-world applications: from system design to experimental validation
No full textIn this communication, two microwave imaging devices to tackle real-world applications are presented. The first one is a device to monitor patients affected by brain stroke in the postacute stage, the second is a device for monitoring packaged food along the production line. The two devices share a common approach to the system development, as they are both designed taking into account the specific constraints imposed by the relevant scenarios and exploiting a rigorous design methodology
A Terahertz Polarization Splitter Using a Hybrid Plasmonic Waveguide
No full textWe investigate a waveguide-based polarization splitter in the terahertz (THz) region, in which a hybrid plasmonic waveguide and a dielectric waveguide are placed in parallel. The eigenmode analysis of each waveguide shows that the phase matching condition is satisfied for the quasi-TE mode and not for the quasi-TM mode, leading to a TM-pass polarizer. The device length is also predicted with the analysis of the supermode of the parallel waveguide
Setup for free space S parameters measurements: Dielectric material characterization up to 330 GHz
No full textThis paper presents the implementation of free space Sparameter measurement setups in the Ka, W and J bands. The complex permittivity is extracted without any specific processing on the S-parameters from 26 up to 330 GHz. The comparison between the measured and simulated four Sparameters (magnitude and phase) shows very good agreement and validates the test benches as well as the calibration procedure
Characteristic Modes for the design of compact radiators on complex platforms
No full textThe placement of a communication system on a three-dimensional platform always poses a series of problems that the antenna designer has to solve or mitigate for guarantee the desired functional operability. Among the several challenges, the need of compact and conformal radiators is one of the hardest tasks to accomplish, especially if working on objects whose dimensions are comparable to the wavelength of interest. The solution to this problem can be pursued by using the Characteristic Mode Analysis
Neurospectral computation of the operating frequency of equilateral triangular patch antenna on suspended substrate
No full textModeling of equilateral triangular patch antenna on suspended and single substrate is presented in this paper. A neurospectral approach is used to compute the resonant frequency of the triangular antenna for the fundamental mode as well as for higher order modes. We show that the use of the neurospectral approach in the analysis of microstrip antennas is a promising fast and accurate technique
Full-Wave Optimization and Design of Nanoparticle Arrays for Various Nano-Optical Applications
No full textRigorous optimization and design of nanoparticle arrays for diverse nano-optical applications, such as coupling, beamshaping, and focusing, using a full-wave optimization environment are presented. An implementation of MLFMA, which is developed for accurate and efficient computations of plasmonic interactions in three-dimensional structures, is integrated into a module of genetic algorithms to perform reliable optimization trials and to reach optimal designs for desired electromagnetic characteristics
Electrical Excitation of Long-Range Surface Plasmons in Organic Light Emitting Diode / Photonic Crystal Structure with Two Metal Nanolayers
No full textA current-driven source of long-range surface plasmons (LRSPs) on a duplex metal nanolayer is reported. We experimentally observe electrical excitation of LRSPs in a planar structure, where an organic light-emitting film is sandwiched between two metal nanolayers, which serve as electrodes. In order to achieve the LRSP propagation in these metal nanolayers at the interface with air, this light-emitting structure is bordered by a one-dimensional photonic crystal (PC) on the other side. The LRSP resonance peak is clearly identified.Â
Dirac cones in SOI photonic crystal slabs: dispersion relation, reflection spectra, selection rules, and non-Hermiticity
No full textWe materialized the mid-IR Dirac-cone dispersion relation with photonic crystal slabs fabricated in SOI wafers. Their dispersion relation, which was measured by angle-resolved reflection spectroscopy with our home-made high-resolution apparatus, agreed well with its numerical calculation and the selection rules derived by the k-p perturbation theory. We also evidenced the distortion of the Dirac cones caused by the non-Hermiticity by the numerical calculation of the dispersion relation and the reflection spectra
Base Station and User Equipment Antennas for 60-GHz-Band Near-Field Wireless Communication System: GATE
No full textThis paper presents base station and user equipment antennas for a 60-GHz-band near-field wireless communication system: gigabit access transponder equipment (GATE). The GATE uses electrically large antennas for base stations to provide a uniform field distribution and low interference between adjacent links