Title :
Near-Field Plates: Metamaterial Surfaces/Arrays for Subwavelength Focusing and Probing
Author :
Grbic, A. ; Merlin, R. ; Thomas, Erin M. ; Imani, M.F.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
In this paper, we present a brief overview of near-field plates, which are nonperiodic grating-like surfaces/arrays that can focus electromagnetic field to subwavelength resolutions. The general properties of near-field plates are described, and the procedure used to design these devices is outlined. The design of two separate near-field plates is discussed in detail. One of the near-field plates produces a subwavelength line (1-D) focus while the other a spot (2-D) focus. Potential applications of near-field plates are also reviewed.
Keywords :
diffraction gratings; metamaterials; optical arrays; optical design techniques; optical focusing; electromagnetic field focusing; metamaterial arrays; metamaterial surfaces; near-field plates; nonperiodic grating; subwavelength focusing; subwavelength line focus; subwavelength probing; subwavelength resolutions; Antenna arrays; Apertures; Current density; Diffraction; Metamaterials; Near-field radiation pattern; Surface impedance; Surface waves; Diffraction limit; evanescent wave; focusing; metamaterials; near field;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/JPROC.2011.2106191
