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Tunable conversion of electromagnetically induced transparency to electromagnetically induced absorption based on vanadium dioxide metastructure

Yu-Jing Yin, You Lv, Yuan‐Zhe Sun, Haifeng Zhang

Published Nov 27, 2023• 4 citations
Publisher
DOI
10.1016/j.ijleo.2023.171554

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This paper puts forward the transmission from twin-peak electromagnetically induced transparency (EIT) to twin-peak electromagnetically induced absorption (EIA), while it is rare to see the transformation between EIT and EIA in metastructure (MS) in one device in previous articles. With the incidence of TE waves, two transparent windows are generated, ranging from 0.382 THz to 0.986 THz which are separated by 0.604 THz, when the conductivity of vanadium dioxide (VO2) is set to 10 S/m. Two peaks reach 0.864 and 0.934, respectively, accompanied by the largest group delays of the two peaks being 7.55 and 4.54 ps. In addition, VO2 blocks in the metallic state will affect interference paths between energy levels, contributing to the formation of EIA, then maintaining a common absorption of 0.607 at 0.429 THz and 0.904 at 0.678 THz. Under the combined action of the dielectric resonator and metal resonator, the conversion from bimodal EIT to bimodal EIA is hardly been researched, at the same time, the adoption of the circuit model and the four-level theory proves the rationality of the model. The transformation from EIT to EIA is aroused by changing the state of VO2, promising broad prospects in multifunctional devices.

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This paper puts forward the transmission from twin-peak electromagnetically induced transparency (EIT) to twin-peak electromagnetically induced absorption (EIA), while it is rare to see the transformation between EIT and EIA in metastructure (MS) in one device in previous articles. With the incidence of TE waves, two transparent windows are generated, ranging from 0.382 THz to 0.986 THz which are separated by 0.604 THz, when the conductivity of vanadium dioxide (VO2) is set to 10 S/m. Two peaks reach 0.864 and 0.934, respectively, accompanied by the largest group delays of the two peaks being 7.55 and 4.54 ps. In addition, VO2 blocks in the metallic state will affect interference paths between energy levels, contributing to the formation of EIA, then maintaining a common absorption of 0.607 at 0.429 THz and 0.904 at 0.678 THz. Under the combined action of the dielectric resonator and metal resonator, the conversion from bimodal EIT to bimodal EIA is hardly been researched, at the same time, the adoption of the circuit model and the four-level theory proves the rationality of the model. The transformation from EIT to EIA is aroused by changing the state of VO2, promising broad prospects in multifunctional devices.
Abstract A chiral metamaterial based on vanadium dioxide (VO 2 ) is proposed to realize the ultrafast active control of an electromagnetically induced transparency-like (EIT-like) effect. The design of the tunable metamaterial is based on the heat-induced insulator-to-metal transition of VO 2 and a tunable transmission peak with circular polarization selectivity is achieved. For the right circular polarization (RCP) laser incidence, the sharp EIT-like peak is generated and rises with the increasing signal powers, which has not happened in the left circular polarization (LCP) incident condition. The spin-dependent phenomenon in time domain is also observed and the slow light effect in the metamaterial yields a tunable time delay up to 4 ns. Therefore, the tunable EIT-like effect with chiral selectivity is presented and highlights its practical applications in programmable metamaterial regions and slow light devices, etc.