Abstract
In classical mechanics, it is well known that a system consisting of two identical pendulums connected by a spring will steadily oscillate with two modes: one at the fundamental frequency of a single pendulum and one in which the frequency increases with the stiffness of the spring. Inspired by this physical concept, we present an analogous approach that uses two metamaterial resonators to realize dual-band-enhanced transmission of microwaves through a subwavelength aperture. The metamaterial resonators are formed by the periodically varying and strongly localized fields that occur in the two metal split-ring resonators, which are placed gap-to-gap on either side of the aperture. The dual-band frequency separation is determined by the coupling strength between the two resonators. Measured transmission spectra, simulated field distributions, and theoretical analyses verify our approach.
Highlights
In classical mechanics, it is well known that a system consisting of two identical pendulums connected by a spring will steadily oscillate with two modes: one at the fundamental frequency of a single pendulum and one in which the frequency increases with the stiffness of the spring
Just as the usual characteristics of naturally occurring materials are derived from the properties of atoms or molecules[7], the unusual characteristics of metamaterials originate from the properties of meta-atoms[2,8] or metamolecules9,10-the subwavelength resonance units, which are generally referred to as metamaterial resonators[11,12,13]
The dual-band frequency separation is determined by the coupling strength of the two metamaterial resonators, which is dependent on the space between the two split-ring resonators (SRRs); d can be varied to obtain dual-band-enhanced transmission at different frequencies
Summary
It is well known that a system consisting of two identical pendulums connected by a spring will steadily oscillate with two modes: one at the fundamental frequency of a single pendulum and one in which the frequency increases with the stiffness of the spring Inspired by this physical concept, we present an analogous approach that uses two metamaterial resonators to realize dual-band-enhanced transmission of microwaves through a subwavelength aperture. That various resonance units are available for metamaterial resonators, we are inspired to use their resonance mechanisms to increase the amount of light that passes through a single aperture This question has been solved through coupled Mie resonances of two ceramic cube particles with high permittivity and with low loss[20]. We present results from simulations and theoretical analyses, and these results are shown to be consistent with the experimental results
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