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Sensors 2014, 14(7), 11786-11804; doi:10.3390/s140711786
Article

Metallic Strip Gratings in the Sub-Subwavelength Regime

1,* , 1,2
 and 3
1 Nondestructive Testing Department, National Institute of R&D for Technical Physics, 47 D., Mangeron Blvd, 700050 Iasi, Romania 2 Faculty of Physics, Al.I.Cuza University, 11 Carol I Blvd, 700506 Iasi, Romania 3 CRISMAT Laboratory, National Graduate School of Engineering, University of Caen on Normandy, 6 Marechal Juin Blvd, Caen 14050, France
* Author to whom correspondence should be addressed.
Received: 16 May 2014 / Revised: 18 June 2014 / Accepted: 25 June 2014 / Published: 4 July 2014
(This article belongs to the Special Issue Metamaterial-Inspired Sensors)
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Abstract

Metallic strip gratings (MSG) have different applications, ranging from printed circuits to filters in microwave domains. When they are under the influence of an electromagnetic field, evanescent and/or abnormal modes appear in the region between the traces, their utilization leading to the development of new electromagnetic nondestructive evaluation methods. This paper studies the behavior of MSGs in the sub-subwavelength regime when they are excited with TEz or TMz polarized plane waves and the slits are filled with different dielectrics. The appearance of propagating, evanescent and abnormal modes is emphasized using an electromagnetic sensor with metamaterials lens realized with two conical Swiss rolls, which allows the extraction of the information carried by the guided evanescent waves. The evanescent waves, manipulated by the electromagnetic sensor with metamaterial lenses, improve the electromagnetic images so that a better spatial resolution is obtained, exceeding the limit imposed by diffraction. Their theoretical and experimental confirmation opens the perspective for development of new types of sensors working in radio and microwave frequencies.
Keywords: sub-subwavelength regime; sensors with metamaterials; metallic strip grating; evanescent modes sub-subwavelength regime; sensors with metamaterials; metallic strip grating; evanescent modes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Savin, A.; Steigmann, R.; Bruma, A. Metallic Strip Gratings in the Sub-Subwavelength Regime. Sensors 2014, 14, 11786-11804.

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