Abstract
Mimicking the quantum phenomena in metamaterials through coupled classical resonators has attracted enormous interest. Metamaterial analogs of electromagnetically induced transparency (EIT) enable promising applications in telecommunications, light storage, slow light and sensing. Although the EIT effect has been studied extensively in coupled metamaterial systems, excitation of electromagnetically induced absorption (EIA) through near-field coupling in these systems has only been sparsely explored. Here we present the observation of the EIA analog due to constructive interference in a vertically coupled three-resonator metamaterial system that consists of two bright and one dark resonator. The absorption resonance is one of the collective modes of the tripartite unit cell. Theoretical analysis shows that the absorption arises from a magnetic resonance induced by the near-field coupling of the three resonators within the unit cell. A classical analog of EIA opens up opportunities for designing novel photonic devices for narrow-band filtering, absorptive switching, optical modulation, and absorber applications.
Highlights
Mimicking the quantum phenomena in metamaterials through coupled classical resonators has attracted enormous interest
The electromagnetically induced transparency (EIT) analog is a result of the coupling between a bright and a dark resonator, where the destructive interference of the resonance modes delivers a sharp window of nearly perfect transmission within a broad absorption band
In conventional metamaterial absorbers[31,32,33], the absorption is found to be related to the vertically anti-parallel magnetic currents, but their transmission is extremely low in a broadband frequency range
Summary
Mimicking the quantum phenomena in metamaterials through coupled classical resonators has attracted enormous interest. The EIT analog is a result of the coupling between a bright and a dark resonator, where the destructive interference of the resonance modes delivers a sharp window of nearly perfect transmission within a broad absorption band. The EIT effect has been recently mimicked in various metamaterial approaches, including cut wires[11,12,13], bilayer fish-scale structures[14], split-ring resonators (SRRs)[15,16,17,18,19] and asymmetric Fano resonators[20] This effect drastically modifies the dispersive properties of an otherwise opaque medium, which leads to fascinating potential applications, such as slow light[11,15,16], photonic switching[15,16], loss reduction[17] and sensing[13,19]. We show that the EIA resonance is a result of constructive interference induced magnetic response of the near-field coupled three-resonator metasurface system
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