Tunable bandwidth of double electromagnetic induced transparency windows in terahertz graphene metamaterial

Wang, Yue; Tao, Mengning; Pei, Zhen; Yu, Xuzheng; Wang, Benhua; Jiang, Jiuxing; He, Xiaodong

doi:10.1039/c8ra06008h

Cited by 12 publications

(3 citation statements)

References 50 publications

(49 reference statements)

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“…investigated the dual-band EIT effect and also studied modulation effect of transparency windows by changing the structural parameters in a MM structure compring of closed ring and a square patch 45 . Also graphene based MM structures have been reported earlier in which dynamic modulation of multispectral plasmon induced transparency effect has been achieved 46–48 . In these investigations, the focus has given to modulate both the transparency windows simultaneously.…”

Section: Introductionmentioning

confidence: 98%

Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

Sarkar

Ghindani

Devi

et al. 2019

Sci Rep

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In this article, we experimentally and numerically investigate a planar terahertz metamaterial (MM) geometry capable of exhibiting independently tunable multi-band electromagnetically induced transparency effect (EIT). The MM structure exhibits multi-band EIT effect due to the strong near field coupling between the bright mode of the cut-wire (CW) and dark modes of pair of asymmetric double C resonators (DCRs). The configuration allows us to independently tune the transparency windows which is challenging task in multiband EIT effect. The independent modulation is achieved by displacing one DCR with respect to the CW, while keeping the other asymmetric DCR fixed. We further examine steep dispersive behavior of the transmission spectra within the transparency windows and analyze slow light properties. A coupled harmonic oscillator based theoretical model is employed to elucidate as well as understand the experimental and numerical observations. The study can be highly significant in the development of multi-band slow light devices, buffers and modulators.

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Section: Introductionmentioning

confidence: 98%

Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

Sarkar

Ghindani

Devi

et al. 2019

Sci Rep

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“…More recent attention has focused on the multi-band PIT effect in THz metamaterials, with multiple transparent windows induced by the coupling effect between THz resonators [37][38][39] . With regard to the switching of the multi-band PIT effect, the quasi-dark resonator is introduced to weakly couple with the free space electromagnetic fields [40,41] .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast all-optical switching of dual-band plasmon-induced transparency in terahertz metamaterials

et al. 2022

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An active ultrafast formation and modulation of dual-band plasmon-induced transparency (PIT) effect is theoretically and experimentally studied in a novel metaphotonic device operating in the terahertz regime, for the first time, to the best of our knowledge. Specifically, we designed and fabricated a triatomic metamaterial hybridized with silicon islands following a newly proposed modulating mechanism. In this mechanism, a localized surface plasmon resonance is induced by the broken symmetry of a C 2 structure, acting as the quasi-dark mode. Excited by exterior laser pumps, the photo-induced carriers in silicon promote the quasi-dark mode, which shields the near-field coupling between the dark mode and bright mode supported by the triatomic metamaterial, leading to the dynamical modulation of terahertz waves from individual-band into dual-band PIT effects, with a decay constant of 493 ps. Moreover, a remarkable slow light effect occurs in the modulating process, accompanied by the dual-transparent windows. The dynamical switching technique of the dual-band PIT effect introduced in this work highlights the potential usefulness of this metaphotonic device in optical information processing and communication, including multi-frequency filtering, tunable sensors, and optical storage.

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“…The Fermi energy of graphene can be tuned by electrostatic voltage. With the help of graphene, active EIT regulation is achieved by changing the external voltage instead of reconstructing geometry [31][32][33][34][35][36][37]. Photosensitive materials such as silicon are an alternative way to achieve the tunable EIT effect.…”

Section: Introductionmentioning

confidence: 99%

Dynamically tunable multi-channel and polarization-independent electromagnetically induced transparency in terahertz metasurfaces

Ren¹,

He²,

Ren³

et al. 2020

J. Phys. D: Appl. Phys.

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Switchable multi-channel electromagnetic induced transparency (EIT) is achieved in designed terahertz metasurfaces. The underlying physics of the EIT effect is analyzed. The influence of structure parameters on the EIT effect is investigated. A metasurface with a symmetrical unit cell is proposed, by which polarization-independent EIT is achieved. In addition, photosensitive silicon is integrated into the metal layer aiming for active modulation. Tunable EIT with adjustable peak frequency and amplitude is obtained. Moreover, the dynamic control is not limited to a single EIT transparency window. We show that the number of EIT transparency windows can be tailored, and switchable multi-channel EIT are successively realized. The results would provide significant guidance in multifunctional active devices, such as modulators and switches in nanophotonics optics.

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Tunable bandwidth of double electromagnetic induced transparency windows in terahertz graphene metamaterial

Abstract: By patterning graphene on a SiO2/Si substrate, in this paper, we design and numerically investigate double electromagnetic induced transparency (EIT) windows in a terahertz metamaterial based on a π-like graphene structure.

Cited by 12 publications

References 50 publications

Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

Ultrafast all-optical switching of dual-band plasmon-induced transparency in terahertz metamaterials

Dynamically tunable multi-channel and polarization-independent electromagnetically induced transparency in terahertz metasurfaces

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