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Metamaterials have attracted tremendous amount of interests owing to their tempting electromagnetic responses. Based on the metamaterials, many novel practical electromagnetic devices have been realized in the microwave, terahertz, and optical frequencies. Recently, a new type of metamaterial filter has attracted growing attention. Based on the method of hybrid multiple resonances, the metamaterial...
In this work, the nonlinear response from metallic metamaterials is characterized by a finite-difference time-domain solution to the Maxwell-hydrodynamic equations. The spatial locations of E-fields (and electric currents) are interleaved with that of magnetic fields. The electron charge is at the center of Yee grids. The current continuity equation connects Maxwell and hydrodynamic equations. For...
Metamaterials have introduced many relevant new possibilities in the manipulation of light, microwaves, sound waves, and other systems. In many cases, the design and optimization of metamaterials has been achieved in conjunction with the mathematical technique of transformation optics, which allows one to guide rays of light or electromagnetic fields along desired directions. This is achieved by tailoring...
The nitrogen-vacancy (NV) center in diamond is attracting a lot of attention in quantum information processing community. A spin system in the NV center is positioned in a clean and well-controlled environment. As a result, it shows outstanding performance as quantum memory, even at room temperature, allows for spin control with a single shot optical readout, and offers a possibility of building quantum...
In this letter, a composite metasurface for end-fire scattering is designed, fabricated and characterized. Based on the principle of scattering cancelation and method of end-fire antenna array, we proposed the lattice-like arrangement composite metasurface (LACMS). When EM waves normally illuminates on the metasurface, the scattering energy redistributes to the end-fire direction. Compared with the...
This paper presents an analysis of a steerable metamaterial reflectarray based on tunable varactor diodes for the Ku-Band. The proposed metamaterial structure is a periodic “K-shape” array that consists of a 12 by 12 matrix with several quantities of varactor diodes that are electronically modulated. The capacitance and series resistance are used to replace the traditional phase tuning methods, such...
The control of electromagnetic radiation lies at the core of many modern technologies. Naturally occurring materials provide only limited electromagnetic response, insufficient for emerging technologies with increasingly demanding requirements. Metamaterials/metasurfaces overcome such an obstacle by realizing exotic electromagnetic properties and enhanced functionalities through a designer approach...
Asymmetric transmission or optical-diode behavior have very important applications in information technology, such as directionally-sensitive beam splitting, multiplexing, and optical interconnection. Here, we propose an all-dielectric chiral metamaterial to realize asymmetric wave transmission in far-infrared band. Made of Si-based double L-shaped resonators on both sides of SiO2 substrate, the three-layered...
Metamaterial Electromagnetically Induced Transparency (EIT) structures have attracted much attention for their significant applications in terahertz rotation sensing, filters, storage and temperature sensing elements. However, most researches on terahertz metamaterial EIT are polarization dependent, which limits their application. In this work, we proposed a terahertz EIT structure with polarization-independence...
We demonstrated that the three-dimensional metamaterial absorbers, consisting of the resistive patches and metallic backboard, can exhibit ultra-broadband and highly efficient absorption for a certain larger incidence of the transverse magnetic wave. The three-dimensional unit cell is constructed by bending the resistive patches, which is arranged at a certain period on the metal plate. Comparing...
In this paper, we proposed a type of all-dielectric metamaterial (ADM) with continues dielectric ceramics. The ceramics, possess high permitivity and low loss, are designed in fishnet shape. With this shape, continuous displacement currents are inspired inside high permitivity ceramics for the incident electromagnetic wave. Then, Lorentz type of electric and magnetic resonances are emerged simultaneously,...
Perfect absorption of electromagnetic (EM) microwaves using metamaterials (MMs) has been investigated greatly these days for the potential applications in EM compatibility, solar energy, bolometer, sensor, etc‥ The problem of EM noise comes to be more serious according to the advent of ubiquitous society. Extended dissemination of high-speed and high-frequency digital products and smart equipments...
Metamaterials have made possible many breakthroughs like electromagnetic cloaks or perfect lenses. In an interesting line of research, metamaterials have been used to simulate celestial objects that were thought to be impossible to replicate at the human scale. For example, the analogous of optical black holes has been theoretically and experimentally realized based on metamaterials. One of the most...
A low frequency (100 KHz∼1 MHz, mainly use in magnetic resonance wireless power transfer system ) permeability measurement method is designed and tested in this paper. In this method, a coaxial cavity and a low frequency band (30 KHz∼8 GHz) Vector Network Analyzer (VNA) are used as measurement equipment. Comparing the impedance change of coaxial cavity, with magnetic material in it or with air, we...
Spatial overlap between the electromagnetic fields and the analytes is a key factor for strong light-matter interaction leading to high sensitivity for label-free optical biosensors. Usually, the exponential fields of cavity modes or surface plasmon resonances are applied to monitor the refractive index variation from bio-reactions. The sensitivity is therefore limited by the influence of local index...
This paper presents the homogenization procedure that takes into account random distribution of SSR resonance frequencies with the normal probability distribution. The resonant band of the effective permeability of the metamaterial composed of 3D system of these SRR is significantly widened, the value of the real part of the permeability is reduced, or the band of negative permeability even disappears.
By stacking metamaterial unit structures (MUSs), an electrically small antenna (ESA) is designed. Without the matching network, such an ESA is shown to be matched to the source load naturally, due to the resonance of the Split-Ring Resonators (SRRs). With stacking technique, it is shown that MUS based ESA can radiate more RF power than those conventional ones. In this abstract, We show a novel method...
The processing of photonic information strongly depends on electronic technique, which limits the speed of information processing. Fortunately, modulation of light with light based on metamaterials creates a new approach to realize photoelectric devices and modulation of photonic information. In this work, we present a tunable broadband polarization conversion based on coherent control, which makes...
We present dual-band metamaterial absorbers that are composed of concentric metal double rings, a dielectric spacer and a metallic ground plane. The coupling between the top electric resonators and the bottom metal layer leads to a strong magnetic resonance. The metamaterial with ordered double rings has two absorption peaks at frequencies of 5.67 GHz and 11.30 GHz with the absorption rates of 99...
In this letter, a potential way to wirelessly transmit power and information simultaneously assembled by ultra-subwavelength magnetic metamaterials (MMs) is proposed. Time-domain experiments are performed to express the ability of manipulation of the magnetic field by MMs. The results demonstrate that MMs possess strong power for widening frequency bandwidth on transferring information. Meanwhile...
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