Topic
Near and far field
About: Near and far field is a research topic. Over the lifetime, 15922 publications have been published within this topic receiving 220571 citations.
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TL;DR: In this article, the authors used far field spatial distortions of gaussian beams after passing through a nonlinear material to measure the nonlinear refractive index at 1.06 μm and 0.53 μm.
176 citations
Patent•
27 Aug 2009TL;DR: In this article, a first shielding box is disposed so that its first surface can be opposite to an electric power feeding unit, and the remaining five surfaces thereof reflect the resonant electromagnetic field (near field) generated in the surroundings of the electric power receiving unit.
Abstract: A first shielding box is disposed so that its first surface can be opposite to an electric power feeding unit. The first surface has an opening and remaining five surfaces thereof reflect, during reception of electric power from the electric power feeding unit, a resonant electromagnetic field (near field) generated in the surroundings of the electric power receiving unit. The electric power receiving unit is provided in the first shielding box to receive the electric power from the electric power feeding unit via the opening (first surface) of the first shielding box. A second shielding box has a similar configuration, i.e., has a second surface with an opening and remaining five surfaces thereof reflect the resonant electromagnetic field (near field) generated in the surroundings of the electric power feeding unit.
175 citations
TL;DR: By starting with a distributed phase plate that is a strictly continuous surface and using only a few cycles of a phase-retrieval algorithm, good fourth-order super-Gaussian fit and lower scattering loss is obtained.
Abstract: The design of phase plates based on a phase-retrieval algorithm has been shown to be successful in achieving high order super-Gaussian distributions in the far field; however, these phase plates exhibit wide-angle scattering losses due to phase discontinuities. We report that, by starting with a distributed phase plate that is a strictly continuous surface and using only a few cycles of a phase-retrieval algorithm, we have obtained good fourth-order super-Gaussian fit and lower scattering loss.
175 citations
28 Mar 1989
TL;DR: Theoretical analysis has implicitly determined the material configuration and electromagnetic parameter values of a single homogeneous layer of dielectric/magnetic material that will produce zero specular reflection as discussed by the authors.
Abstract: The design of effective broadband, thin-layer, electromagnetic absorbers for operation in the VHF/UHF regime has led to creation of design aids for custom-tailoring magnetic materials for this application. Theoretical analysis has implicitly determined the material configuration and electromagnetic parameter values of a single homogeneous layer of dielectric/magnetic material that will produce zero specular reflection. Based on this analysis, an easy-to-use explicit graphic aid for determining these properties has been produced. This not only simplifies the design process, but also provides an overall view of the interrelated numerical values of material properties required to implement specular electromagnetic absorber designs. >
174 citations