The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Next generation solar energy converters rely on a combination of principles involving optics, thermodynamics, and device physics. To aid in the experimental design, it is often necessary to develop theoretical and computational models to guide the research. For traditional solar cells, standard computational packages are available; however, for more advanced designs incorporating sub-wavelength optical...
There have been extensive research to systematically tailor terahertz (THz) plasmonics structures to support strong resonant modes as platforms for designing practical nano and microscale devices with high efficiency and tunability. Here, using a symmetric four-member assembly of plasmonic vee-shaped structures, we introduce a quadratic, multiresonant plasmonic THz antenna to support significant resonant...
VLBI (Very Long Baseline Interferometry) is an important radio astronomy technology, is widely used in deep-space probers high-precision measurement. The correlator as the core data pre-processing equipment of VLBI, its performance is very important. In Chang'E mission, VLBI data playback and process just 256 Mbps in real-time before. Now the more quickly, precision, and more stations be need in next...
Electromagnetic Inverse scattering problem has attracted vast attentions due to its wide application in geological exploration, security check, medical imaging and through wall imaging. The problem is commonly equivalent into a nonlinear optimization problem and regularization method is used to stabilize the ill-conditioned problem.
A new HSS (Hierarchically Semiseparable) direct matrix solution algorithm, including both factorization and inversion, is developed for solving the volume integral equation (VIE) for large-scale electrodynamic analysis. This direct solution algorithm is exact in the sense that the matrix factorization, inversion, and solution do not involve any approximation. The HSS-representation of the VIE dense...
In the article distinctive feature for modern IT equipment present on the European Union market have been presented. The collected measurement results of radiated emission generated by particular components of IT devices allowed it to build data base which could be used for identification of components characterized by too high level of radiated emission. This paper describes the implementation a...
We embed varactors as active circuit elements within a metamaterial absorber to implement a tunable metamaterial absorbers at microwave frequencies. The microwave absorption of the designed absorbers can be tuned by changing the reverse bias voltage on the varactor diodes. The design of varactor-loaded metamaterial absorbers has a low-cost compact planar structure with simple scalability and a feasible...
The objective of this paper is to discuss major factors that affect the magnetic filed distribution of a wireless power transfer (WPT) system for electric vehicle (EV) charging. Both analytical and simulation approaches with a 3D finite element method (FEM) are employed to analyze the flux distribution in the system and its surroundings. The purpose of the work is to provide design guidelines for...
The efficient analysis and engineering of the polarization state is imperative in diverse disciplines, including physics, materials science, biology and quantum optics. For instance, scientists apply circularly polarized light to manipulate the spin state of electron for quantum information processing. Chrysina gloriosa (jeweled beetles) under left-handed circularly polarized light illumination appear...
Surface Plasmons (SPs) are an intriguing form of electromagnetic waves that propagate at metal-dielectric interface, and have promised various cutting-edge applications, such as biological sensing, deep-subwavelength lasing, high-resolution imaging and plasmonic circuitry. Seeking new methods in controlling SPs is highly demanded in developing next-generation integrated photonic components and devices...
It is well known that the eigen frequency (f) of a harmonic oscillator is determined by the oscillator effective mass (meff) and spring constant (keff) according to the Hook's law equation. An optical whispering gallery microcavity, when the wavelength of the injected light coincides the cavity resonance, establishes tremendous amount of light circulating along its equator. For an ultra-high quality...
The method of computer simulation of microwave devices and special laboratory workshops is described. Simulated laboratory has a module structure. The basis for constructing a model of the specific workshop is a concept of the abstract “device” with layout is identical to the installation of a real one. The software interface allows changing the configuration and frequency tags to carry out all necessary...
Article concerns the problems associated with high power electromagnetic environment. The article describes an electromagnetic high power pulse and discusses the laboratory stand to generate this pulses. The paper presents method for estimating immunity informatics devices for high power electromagnetic pulses carried in the LAB-KEM MUT. Estimation immunity of informatics devices will help you understand...
We develop an unconditionally stable matrix-free time-domain method for analyzing general electromagnetic problems discretized into arbitrarily shaped unstructured meshes. This method does not require the solution of a system matrix, no matter which element shape is used for space discretization. Furthermore, this property is achieved irrespective of the time step used to perform the time domain simulation...
Silicon photonic devices and integrated circuits are vulnerable to fabrication-induced process variations (a.k.a. fabrication non-uniformity). Designing silicon photonic integrated circuits (PICs) for wavelength-division multiplexing (WDM)-based applications requires a careful consideration of fabrication-induced process variations. While numerical simulations (e.g., FDTD) help predict a device's...
Terahertz (THz) radiation has attracted a lot of attentions due to its fascinating potential applications. However, the traditional THz devices have relatively large size due to the long wavelength nature of the THz radiation. Several metasurface-based THz devices, including lens, computer generated holograms, spin selected focusing lens, as well as wavelength selected diffractive elements, have been...
High efficiency solar light absorbers covering the wideband solar optical radiation spectrum from UV to IR are significant for thermophotovoltaic solar energy systems. In this talk, we will present our recent simulation and experimental works on wideband solar light perfect absorbers in the spectral range from 400nm to 2500nm by using low cost metal-dielectric thin film layer structures. Our designed...
Metasurfaces, two-dimensional metamaterials consisting of engineered structures, have recently emerged as an exciting “flat” platform to manipulate electromagnetic waves in a prescribed manner. The tunability and reconfigurability are urgently needed for of metasurfaces in order to perform distinctive functionalities and miniaturize the device footprint. In this talk, I will first discuss tunable...
In this paper we present measurements of the magnetic flux density in an office and three different welding environments. The measured values are compared with the thresholds set by the EU Directive 2013/35/EU. For the office environment, a magnetic field survey is presented at different heights with the electrical appliances operating in different modes. For the welding workshop, measurements were...
As we all know, in broadband arrays situation, the beam width would narrow down with the increasing of frequency, which means the signal spectrum would be distorted in the interested frequency domain. Frequency-invariant beam pattern (FIBP) is the one whose amplitude keep almost constant in the specified range. For the superiority of the FIBP, quantities of work have been done recent years, however,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.