Abstract
The electromagnetically-induced transparency (EIT)-like effects in planar and non-planar metamaterials (MMs) were investigated for microwave (GHz) frequencies. The specific MMs used in this study consisted of a cut-wire resonator and a ring resonator, where were placed on the top and the bottom layers, respectively. A transmission window was produced, due to the interference between bright- and bright-mode coupling. Using the numerical and the experimental results, we demonstrate that the bending of MM leads to enhanced transmission and bandwidth, as well as an additional EIT-like peak. This provides an effective way of realizing the tunable devices, including the switching sensors.
Highlights
Electromagnetically-induced transparency (EIT) is a quantum interference effect which is activated in coherent interaction between atomic ensembles[1]
The electromagnetically-induced transparency (EIT)-like behavior occurs without the dark-mode excitation, which is described by the interference between bright modes[15]
Two types of resonators were fabricated at the top [a cut-wire resonator (CWR)] and the bottom [a ring resonator (RR)] of FR-4 substrate
Summary
Electromagnetically-induced transparency (EIT) is a quantum interference effect which is activated in coherent interaction between atomic ensembles[1]. The coherent processes, leading to EIT, have been observed in MMs8 This can relax dramatically the difficulty in the experimental realization because of the room-temperature operation and of no need for external activation by pumping lasers. By placing two types of resonators on the top and the bottom layers, they can have different phases This allows us to have the classical analogue of EIT-like effect due to the phase coupling between CWR and RR, which leads to the enhanced transmission in the microwave range. To control effectively the transmission peak using two types of resonator modes, we have investigated the bending effect at GHz frequencies in this EIT MM. This response tuning via bending the MM is useful for holographic and active filters, but applications involving biosensing[22,23,24]
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