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Science 25 April 2008:
Vol. 320. no. 5875, pp. 511 - 513
DOI: 10.1126/science.1154753
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Reports

Near-Field Plates: Subdiffraction Focusing with Patterned Surfaces

Anthony Grbic,1* Lei Jiang,2 Roberto Merlin2

Using a patterned, grating-like plate to control the electromagnetic near field, we demonstrate focusing well beyond the diffraction limit at ~ 1 gigahertz. The near-field plate consists of only capacitive elements and focuses microwaves emanating from a cylindrical source to a spot of size {approx} {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-transfer systems, microscopy, and lithography.

1 Radiation Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109–2122, USA.
2 Frontiers in Optical Coherent and Ultrafast Science Center and Department of Physics, University of Michigan, Ann Arbor, MI 48109–1040, USA.

* To whom correspondence should be addressed. E-mail: agrbic{at}umich.edu

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