title: Metallic strip gratings in the sub-subwavelength regime.
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 TE(z) or TM(z) 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.
authors.affiliation: Nondestructive Testing Department, National Institute of R&D for Technical Physics, 47 D., Mangeron Blvd, 700050 Iasi, Romania. asavin@phys-iasi.ro.
authors.forename: Adriana
authors.initials: A
authors.lastname: Savin
authors.affiliation: Nondestructive Testing Department, National Institute of R&D for Technical Physics, 47 D., Mangeron Blvd, 700050 Iasi, Romania. steigmann@phys-iasi.ro.
authors.forename: Rozina
authors.initials: R
authors.lastname: Steigmann
authors.affiliation: CRISMAT Laboratory, National Graduate School of Engineering, University of Caen on Normandy, 6 Marechal Juin Blvd, Caen 14050, France. bruma.alina@ensicaen.fr.
authors.forename: Alina
authors.initials: A
authors.lastname: Bruma