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, a 3D modified boundary layer analysis is performed using the finite element method to study the crack-front constraint for an elastic-plastic thin plate, and the results show that the in-plane-stress fields at the crack front for various K I − T loads possess the plane-strain nature throughout the thickness except for the region near the free surface, and can be characterized by the J-A 2 three-term solution under the small scale yielding condition.
56 citations
Patent•
08 Aug 2008
TL;DR: In this article, a masking signal transmitter is used with the near field generator and radiates a masked electromagnetic signal, which may substantially mask the incidental electromagnetic radiation in a near field communication system.
Abstract: A near field communication system can include a near field generator configured to generate a near field detectable information signal. The near field generator and supporting circuitry also produces incidental electromagnetic radiation. A masking signal transmitter is used with the near field generator and radiates a masking electromagnetic signal. The masking electromagnetic signal may substantially mask the incidental electromagnetic radiation.
56 citations
TL;DR: The intrinsic spatial resolution of a thermal wave microscope in the extreme near field limit is independent of thermal wavelength and is determined by the depth of the thermal scatterer beneath the surface of the specimen as discussed by the authors.
Abstract: It is demonstrated theoretically and confirmed experimentally that the intrinsic spatial resolution of a thermal wave microscope in the extreme near field limit is independent of thermal wavelength and is determined by the depth of the thermal scatterer beneath the surface of the specimen.
56 citations
TL;DR: It is proved analytically that the far-field optical properties of pentamers have to be polarization-independent due to their rotational symmetry, and the coupled dipole approximation method is employed to define a qualitative model revealing the relationship between the near and far field in such structures.
Abstract: Flexible control over the near- and far-field properties of plasmonic nanostructures is important for many potential applications, such as surface-enhanced Raman scattering and biosensing. Generally, any change in the polarization of the incident light leads to a change in the nanoparticle’s near-field distribution and, consequently, in its far-field properties as well. Therefore, producing polarization-invariant optical responses in the far field from a changing near field remains a challenging issue. In this paper, we probe experimentally the optical properties of cruciform pentamer structures—as an example of plasmonic oligomers—and demonstrate that they exhibit such behavior due to their symmetric geometrical arrangement. We demonstrate direct control over hot spot positions in sub-20 nm gaps, between disks of 145 nm diameter at a wavelength of 850 nm, by means of scattering scanning near-field optical microscopy. In addition, we employ the coupled dipole approximation method to define a qualitative m...
56 citations
Journal Article•
TL;DR: In this paper, a near-field probe fabrication technique for far-infrared frequencies based on photoconducting antennas is developed, which is accomplished by means of an aperture and protruding high refractive index tip.
55 citations