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Engineering the electromagnetic properties of periodic nanostructures using electrostatic resonances
Electromagnetic properties of periodic two-dimensional subwavelength structures consisting of closely packed inclusions of materials with negative dielectric permittivity epsilon in a dielectric host with positive epsilon(h) can be engineered using the concept of multiple electrostatic resonances. Fully electromagnetic solutions of Maxwell's equations reveal multiple wave propagation bands, with the wavelengths much longer than the nanostructure period. Some of these bands are described using the quasistatic theory of the effective dielectric permittivity epsilon(qs). Those bands exhibit multiple cutoffs and resonances which are found to be related to each other through a duality condition. An additional propagation band characterized by a negative magnetic permeability is found. Imaging with subwavelength resolution in that band is demonstrated. 相似文献
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D. Korobkin Y.A. Urzhumov B. Neuner III C. Zorman Z. Zhang I.D. Mayergoyz G. Shvets 《Applied Physics A: Materials Science & Processing》2007,88(4):605-609
We theoretically and experimentally study electromagnetic properties of a novel mid-infrared metamaterial: optically thin
silicon carbide (SiC) membrane perforated by an array of sub-wavelength holes. Giant absorption and transmission is found
using Fourier transformed infrared (FTIR) microscopy and explained by introducing a frequency-dependent effective permittivity
εeff(ω) of the perforated film. The value of εeff(ω) is determined by the excitation of two distinct types of hole resonances: delocalized slow surface polaritons (SSPs) whose
frequencies are largely determined by the array period, and a localized surface polariton (LSP) corresponding to the resonance
of an isolated hole. Only SSPs are shown to modify εeff(ω) strongly enough to cause giant transmission and absorption. Because of the sub-wavelength period of the hole array, anomalous
optical properties can be directly traced to surface polaritons, and their interpretation is not obscured by diffractive effects.
Giant absorbance of this metamaterial can be utilized in designing highly efficient thermal radiation sources.
PACS 41.20.Cv; 42.70.Qs; 71.45.Gm 相似文献
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为提高土壤多元素同时检测的效率,采用超级微波消解-电感耦合等离子体发射光谱法测定土壤中钾、钠、钙、镁、铜、铁、锰、锌、磷、硫、硼、砷、镉、铬、铅、钴、镓、锂等18种元素含量。比较了超级微波消解、常规微波消解和电热板消解的处理效果,采用超级微波消解法对样品进行前处理,并优化了消解条件。在最优条件下,各元素的检出限在0.05~20 mg/kg,加标回收率在86.2%~107.5%,RSD在0.1%~3.0%,方法准确度及精密度可以满足多元素同时测定的需求,且该方法具有简单、快速、成本低、用酸量少、重现性好等特点。 相似文献
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In this paper we study the dispersion relation of thermal non-neutral plasma column by MHD theory. We use the dispersion relation to discuss the stability and dispersive properties in a non-neutral plasma-filled waveguide. The results are in agreement with those of cold non-neutral plasma. 相似文献
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Yuli YA. Gotlib 《Macromolecular Symposia》1999,146(1):81-87
The dynamic network model taken into account the friction relative to incompressible effective viscous medium (EVM), the hydrodynamic interactions of a network with the EVM, and the interchain friction is considered. Two collective network relaxation spectra (RS) arise. The first RS corresponds to the network motion relative to immobile EVM, the EVM does not take part in this motion. The second RS includes the combined viscous motion of the network and EVM because of long-range hydrodynamic interactions. This RS is finite and narrow for infinitely large network. The symmetry of this motion is in concordance with that of incompressible EVM. The existence of interchain friction leads to the narrowing of both types of relaxation spectra. 相似文献