Magnetic response of split-ring resonators in the far-infrared frequency regime.
We report on the fabrication, through photolithography techniques, and the detailed characterization, through direct transmission measurements, of a periodic system composed of five layers of photolithographically aligned micrometer-sized Ag split-ring resonators (SRRs). The measured transmission spectra for propagation perpendicular to the SRRs plane show a gap around 6 THz for one of the two possible polarizations of the incident electric field; this indicates the existence of a magnetic resonance, which is verified by detailed theoretical analysis. To our knowledge this is the first time that a system of more than one layer of micrometer-sized SRRs has been fabricated. The measured optical spectra of the Ag microstructure are in very good agreement with the corresponding theoretical calculations.
Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, P.O. Box 1527, Heraklion 71110, Crete, Greece.
N
N
Katsarakis
G
G
Konstantinidis
A
A
Kostopoulos
R S
RS
Penciu
T F
TF
Gundogdu
M
M
Kafesaki
E N
EN
Economou
Th
T
Koschny
C M
CM
Soukoulis