Near-field focusing plates

  • Grbic A
  • Lei J
  • Merlin R
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Abstract

We describe the design of near-field focusing plates, which are grating-like structures that can focus electromagnetic radiation to spots or lines of arbitrarily small subwavelength dimension. A general procedure is outlined for designing a near-field plate to achieve a desired focus, and its implementation at microwave frequencies is discussed in detail. Full-wave (method of moments) simulations clearly demonstrate a passive near-field plate's ability to overcome the diffraction limit. Finally, it is shown that performance of the plates is weakly affected by losses..

Author-supplied keywords

  • Diffraction limit
  • Evanescent waves
  • Metamaterials
  • Near field
  • Superlens

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Authors

  • Anthony Grbic

  • Jiang Lei

  • Roberto Merlin

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