title: Near-field investigation of the effect of the array edge on the resonance of loop frequency selective surface elements at mid-infrared wavelengths.
abstract: Mid-infrared scattering scanning near-field optical microscopy, in combination with far-field infrared spectroscopy, and simulations, was employed to investigate the effect of mutual-element coupling towards the edge of arrays of loop elements acting as frequency selective surfaces (FSSs). Two different square loop arrays on ZnS over a ground plane, resonant at 10.3 µm, were investigated. One array had elements that were closely spaced while the other array had elements with greater inter-element spacing. In addition to the dipolar resonance, we observed a new emergent resonance associated with the edge of the closely-spaced array as a finite size effect, due to the broken translational invariance.
authors.forename: Eric
authors.initials: E
authors.lastname: Tucker
authors.forename: Jeffrey
authors.initials: J
authors.lastname: D' Archangel
authors.forename: Markus B
authors.initials: MB
authors.lastname: Raschke
authors.forename: Glenn
authors.initials: G
authors.lastname: Boreman