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An Experimental Concentric Near-Field Plate

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2 Author(s)
Imani, M.F. ; Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan at Ann Arbor, Ann Arbor, MI, USA ; Grbic, A.

We present a concentrically corrugated near-field plate that can form a subwavelength near-field focal spot. The experimental plate consists of a coaxial aperture surrounded by nonperiodic concentric corrugations. The measured subwavelength patterns are shown to be significantly narrower than those created by a coaxial probe (without corrugations) of similar dimensions. Close agreement between simulated and measurement results is observed. Further, the subwavelength beam emitted by the corrugated near-field plate is shown to be narrower that of the coaxial probe, confirming the superior electromagnetic confinement achieved by the near-field plate over a focal length. Finally, the near-field plate is used to image two sources separated by subwavelength distances. The images obtained using the near-field plate exhibit significantly higher resolution than those obtained using a coaxial probe. The reported near-field plate will find use in near-field probing and microscopy applications.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:58 ,  Issue: 12 )