Abstract. In this paper a
transmission of electromagnetic radiation through a multilayer metamaterial
metal-dielectric structure (multi-fishnet) with new original design of
rhombus-like subwavelength apertures in the near field as well as in the far
field at microwave frequencies is considered. This multilayer stack consists of
alternate periodically patterned metal foils and unperforated dielectric
layers. The about eightfold enhancement of the microwave electric field
strength behind the central part of the single subwavelength aperture in the
form of a rhombus was observed in near field for all the studied foliated
samples with the number of perforated aluminium layers from 2 to 12 at frequencies
from 7 GHz to 20 GHz. This effect that first disclosed by Ebbesen within the
optical range can be useful for both better understanding of the propagation
behaviour of the electromagnetic waves and creation of various practical
devices utilizing this effect. The number of peaks in the transmission spectrums
of the foliated metamaterial samples in the far field is equal to the number of
dielectric spacers within a multilayer metamaterial structure. These dielectric
spacers play a role of resonators providing the feature of the transmission
spectrum similar to Fabry-Perot resonance. The resonant character of
transmission for the investigated multilayer metamaterial stack is confirmed by
the experimental microwave electric field patterns around the multilayer
sample. The experimentally obtained results suppose the presence of a negative
effective refractive index at the studied foliated metamaterial during its
resonant pass band.
Keywords: metamaterial, multilayer
structures, microwaves, transmission spectrum, surface plasmons, perforated
metallic layers, Fabry-Perot cavities.
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