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Recently, we have developed the method of broadband Green's function with low wavenumber extraction (BBGFL) to investigate the problem of arbitrary shaped waveguides [1]. In the past, the Boundary Integral-the Resonant Mode Expansion (BIRME) [2, 3] method was applied to calculate the modes of an arbitrary shaped waveguide with a homogenous dielectric. In BIRME, a DC extraction is applied to remove...
Ultrashort laser interactions with dielectrics are numerically investigated by using a multi-physics approach based on Maxwell's equations coupled with a multiple rate free carrier density equation and with the integrated two-temperature model describing the energy transfer from the conduction band electrons to lattice. The model accounts for a complete Keldysh photoionization rate, impact ionization...
Design and characterization of periodic dielectric or metallic structures such as photonic crystals and plasmonic metamaterials with unique electromagnetic responses have stimulated extensive attention due to the unusual physical phenomena and the potential applications in electromagnetic devices. These artifical materials are based on the original concept of manipulating electromagnetic waves by...
In this paper, we summarize the formulation of the augmented electric field integral equation to solve perfect electric conductor and dielectric problems. By studying the numerical integrations of the lossy Green's function, we extend this formulation for dielectrics to conductors precisely. We develop a novel angular integral method to evaluate the numerical integrals. This method turns out to be...
An inverse scattering problem of determining the electrical property of an unknown dielectric object is considered. The electromagnetic wave generated by an impressed electric current with a short duration time illuminates the dielectric object. The measured data of the total field, the sum of the incident and scattered fields, over an observation surface S is used to reconstruct the electrical property...
Results from numerical simulations to detect small dielectric inclusions surrounded by dielectric random scatterers have shown the feasibility of the MUltiple SIgnal Classification (MUSIC) algorithm, but further improvements must be made. In this paper, we consider the success of the multi-frequency MUSIC algorithm in detecting such inhomogeneities. Furthermore, we introduce the weighted multi-frequency...
Graphene sheets can support surface plasmon as the Dirac electrons oscillate collectively with electromagnetic waves. Compared with the surface plasmon in conventional metal (e.g., Ag and Au), graphene plasmonic owns many remarkable merits especially in Terahertz and far infrared frequencies, such as deep sub-wavelength, low loss, and high tunability. For graphene coated dielectric nano-scatters,...
Nanoantennas have demonstrated unprecedented capabilities for manipulating the intensity and direction of light emission over a broad frequency range. The directional beam steering offered by nanoantennas has important applications in areas including microscopy, spectroscopy, quantum computing, and on-chip optical communication. Although the Kerr effect has been explored to control the far-field radiation...
The electromagnetic wave absorption mechanism of conductorbacked electromagnetic wave absorbers with periodically arranged conductor patterns on the surface layer (pattern absorbers) was investigated. The pattern absorbers in this work were composed of a patterned layer acting as a frequency selective surface, such that the pattern served as a resonator together with a back reflector. Electromagnetic...
We theoretically demonstrate a convex-concave organic solar cell based on two-dimensional arrayed silica (SiO2) dielectric nanospheres loaded above the indium tin oxide (ITO) substrate, which can bring efficient light trapping in the active layer. In simulation, the PEDOT: PSS (buffer) and the PSBTBT:PC71BM (active) layers are conformal to that of the SiO2 nanospheres, i.e., in the convex-concave...
We analyse and compare the effects of the spatial dispersion and structural anisotropy on the spectrum of a metamaterial slab. Dielectric function of the slab we describe within Drude-Lorentz approximation. Anisotropy is of the slab is introduced through the anisotropy of plasma frequencies corresponding to the different component of the permittivity tensor. Spatial dispersion is considered within...
This paper investigates transmission characteristics of a microstrip line (MSL) with a noise suppression sheet (NSS) when thickness and permittivity of an adhesive between the NSS and the MSL are changed. The MSL based on IEC standard (IEC62333-2) is fabricated, and a transmission characteristic of the MSL attached with a dielectric-adhesive-backed NSS is simulated by a software Agilent's EMpro.
In this paper, the artificial dielectric material with anisotropic permittivity is proposed to lower the resonant frequency of square patch antenna. The anisotropic artificial dielectric material is applied to replace the dielectric material usually used for implementing the conventional square patch antenna. Here, the conventional square patch antenna which is designed based on TM10 resonance mode...
This paper compares sequential subarrays of dielectric resonator and patch antennas in terms of circular polarization and impedance bandwidths, and realized gain using hybrid ring feeding networks. Aperture coupled antenna is used as the basic structure.
The present work investigates a novel cylindrical dielectric resonator antenna (CDRA) excited by a coaxial feed monopole, which is mounted on a circular substrate with a deformed ground plane. A vertical electric monopole is placed in the center of the DR. The wideband characteristic is achieved by the deformed ground plane. The features of the proposed antenna meet the essential requirements of X-band...
Radial Line Slot Antennas (RLSAs) are well known as a high gain, high efficiency planar slotted array antennas. Due to its high gain characteristic, low losses, high efficiency and compact structure, RLSA has been proposed for satellite communications to substitute the conventional parabolic antennas. Several structures where studied previously, mainly operating in C-band with a huge number of slots...
Electromagnetic problems with both conducting and dielectric media are formulated through volume-surface integral equations (VSIEs) in integral equation approach. The conducting part is described by surface integral equation while the dielectric part is governed by volume integral equations (VIEs) and they are coupled together by produced fields. The VSIEs are usually solved by the method of moments...
The features of omnidirectional band gap (OBG) in the two-dimensional (2D) plasma photonic crystals (PPCs) with triangular lattices are theoretically investigated as the off-plane incidence wave vector is considered, which are composed of the unmagnetized plasma cylinders inserted into the homogeneous and isotropic dielectric background. The simulated results show that not only a flatbands region...
In this paper, the properties of photonic band gaps (PBGs) in two types of two-dimensional plasma-dielectric photonic crystals (2D PPCs) under transverse-magnetic (TM) wave are theoretically investigated by a novel modified plane wave expansion (PWE) method as Monte Carlo method is introduced. The configuration of 2D PPCs is the square lattices with fractal Sierpinski gasket structure whose constituents...
An efficient method for analysis of electromagnetic scattering from three-dimensional objects straddling the interface of a half space has been presented. The analysis of scattering from objects within a half space has been equivalent to the analysis of scattering from composite dielectric objects in free space to enhance the computational efficiency. Different from the traditional method, the Green's...
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