Near-Field Plates: Subdiffraction Focusing with Patterned Surfaces

Abstract

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Magnetic superlens-enhanced inductive coupling for wireless power transfer

“…22) and further developed by Pendry et al in 2000, 23 is a planar slab whose electric permittivity and magnetic permeability both assume the values of -1 at a given frequency; a source placed on one side of the perfect lens is reproduced as an image on the other side of the slab, with both far-and near-fields refocused to the image. [23][24][25][26][27][28][29] In the WPT context, the perfect lens geometry is a good starting point for improving the efficiency of coupling between two coils. Viewing the first coil as a source, any loss in transfer efficiency to the receiver can be explained using the concept of magnetic flux divergence, which is bound to happen at distances greatly exceeding the dimensions of the source.…”

Application of Surface Plasmon Polaritons in CMOS Digital Imaging

“…The results therefore suggest that the f = 6.1 m lens works close to its theoretical limit. Subdiffraction focusing elements based on near-field effects were reported to be able to focus electromagnetic waves to a spot of size less than /10 [46][47][48]. However, the focal length is limited to dimensions much less than the wavelength, which is about 100 times less than our devices.…”

The Effect of Antenna Incident Field Distribution on Microwave Tomography Reconstruction

“…The second method relies on modification of the individual antenna element to achieve a focused near-field distribution. Within this framework, the use of microwave near-field plates, whose ability to achieve focusing in near-field has been recently demonstrated [20], seems very promising. Also, the use of appropriate modifications such as incorporating a dielectric director [21] into the individual antenna element is another possibility.…”