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

Volume

99

Issue

10

fYear

2011

Firstpage

1806

Lastpage

1815

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;

fLanguage

English

Journal_Title

Proceedings of the IEEE

Publisher

ieee

ISSN

0018-9219

Type

jour

DOI

10.1109/JPROC.2011.2106191

Filename

5759721