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Published in: Optical and Quantum Electronics 1/2024

01-01-2024

Tunable electromagnetically induced transparency metamaterial utilizing bright-dark mode coupling between electric and toroidal resonances

Authors: Chang Shu, Jinshuo Mei, Hongyi Sun, Liying Chen, Yan Sun

Published in: Optical and Quantum Electronics | Issue 1/2024

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Abstract

We investigated an electromagnetically induced transparency metamaterial and provided a comprehensive demonstration of its tunable electromagnetic characteristics in the terahertz region. Within a unit cell, a pair of horizontally aligned metal wires induces electric resonance, functioning as bright mode resonators. Additionally, a hybrid structure composed of metal and vanadium dioxide is employed to generate toroidal resonance, serving as dark mode resonators. Analysis of the scattered power reveals an enhancement of the energy associated with toroidal resonance within the transparent window. Simulation results illustrate a gradual reduction in the coupling strength of the electromagnetically induced transparency effect, and the transparency peak shifts toward the lower frequency range with decreasing conductivity of vanadium dioxide. Ultimately, the electromagnetically induced transparency phenomenon dissipates, resulting in a transmission spectrum characterized by a resonance curve. Theoretical analysis based on a two-coupled oscillator model unveils that the tunable effect of the electromagnetically induced transparency metamaterial is attributed to the modulation of damping rate and intrinsic resonant frequency of the dark mode resonator, achieved through adjustments in the conductivity of vanadium dioxide. This proposed approach holds promise for enhancing electromagnetically induced transparency implementations and expanding the application domains of toroidal metamaterials.

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Metadata
Title
Tunable electromagnetically induced transparency metamaterial utilizing bright-dark mode coupling between electric and toroidal resonances
Authors
Chang Shu
Jinshuo Mei
Hongyi Sun
Liying Chen
Yan Sun
Publication date
01-01-2024
Publisher
Springer US
Published in
Optical and Quantum Electronics / Issue 1/2024
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI
https://doi.org/10.1007/s11082-023-05647-2

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