Near-field plates: subdiffraction focusing with patterned surfaces.

  title={Near-field plates: subdiffraction focusing with patterned surfaces.},
  author={Anthony Grbic and Lei Jiang and Roberto Merlin},
  volume={320 5875},
Using a patterned, grating-like plate to control the electromagnetic near field, we demonstrate focusing well beyond the diffraction limit at approximately 1 gigahertz. The near-field plate consists of only capacitive elements and focuses microwaves emanating from a cylindrical source to a spot of size approximately lambda/20 (half-power beamwidth), where lambda is the free-space wavelength. These plates will find application in antennas, beam-shaping devices, nonradiative wireless power… CONTINUE READING
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