Dual-band electromagnetically induced transparency effect in a concentrically coupled asymmetric terahertz metamaterial

Devi, Koijam Monika; Chowdhury, Dibakar Roy; Kumar, Gagan; Sarma, Amarendra K.

doi:10.1063/1.5040734

Cited by 38 publications

(22 citation statements)

References 46 publications

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“…Papasimakis et al reported a similar phenomenon in the microwave domain using bilayered fish-scale metamaterials [79]. Later Tassin et al demonstrated EIT-like effects at the operational frequency range of 35-40 THz, which together with a set of other studies [80][81][82][83][84][85][86], formed the basis of metamaterial-based EIT/PIT research.…”

Section: Electromagnetically Induced Transparency (Eit) Effects In Terahertz Metamaterials Resonancesmentioning

confidence: 89%

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

Banerjee

Pal

Chowdhury

2020

Journal of Electromagnetic Waves and Applications

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Most electromagnetic phenomena pertaining to metamaterials are observed at the resonance positions. In this review, we have collated and analyze the most prevalent forms of resonance-based phenomena observed in metamaterials to serve as a ready reference for future researchers. Our focus will be on metamaterials operating at the terahertz frequency domain. Starting with the origin and evolution of fundamental LC resonances in metamaterials, we would explain occurrence of typical even and odd higher order resonance modes. We have also discussed Fano resonances in asymmetric gap resonators-based metamaterials. Further, quantum phenomena analogues, such as, electromagnetically induced transparency (EIT) or Plasmon Induced Transparency (PIT), which can significantly influence the metamaterials resonances are also discussed. Thereafter, origins to ultra-sharp resonances in toroidal metamaterials, along with chiral metamaterials and resonance mode hybridization effects in the context of terahertz metamaterials are described. This review should be useful for undertaking.

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Section: Electromagnetically Induced Transparency (Eit) Effects In Terahertz Metamaterials Resonancesmentioning

confidence: 89%

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

Banerjee

Pal

Chowdhury

2020

Journal of Electromagnetic Waves and Applications

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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] . Thus, the multi-band PIT effect occurs, stemming from the near-field electrical coupling between the resonant modes in a three-level system comprising the bright mode, dark mode, and quasi-dark mode [42] .…”

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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“…To overcome the above limitation, a variety of THz MSs with multi-band EIT windows were designed to actively modulate resonance properties by means of different approaches, including mechanical movement, phase change material, and graphene. For example, Devi et al designed a concentrically coupled asymmetric THz MS to obtain a dual-band EIT effect; moreover, the dual-band EIT effect can be effectively modulated by rotating the element angle or by changing the asymmetric degree of the unit cell [ 11 ]. Chen et al demonstrated an actively tunable dual-band EIT window in a VO 2 -integrated MSs [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene-Modulated Terahertz Metasurfaces for Selective and Active Control of Dual-Band Electromagnetic Induced Reflection (EIR) Windows

Sun

Wang

et al. 2021

Nanomaterials

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Currently, metasurfaces (MSs) integrating with different active materials have been widely explored to actively manipulate the resonance intensity of multi-band electromagnetic induced transparency (EIT) windows. Unfortunately, these hybrid MSs can only realize the global control of multi-EIT windows rather than selective control. Here, a graphene-functionalized complementary terahertz MS, composed of a dipole slot and two graphene-integrated quadrupole slots with different sizes, is proposed to execute selective and active control of dual-band electromagnetic induced reflection (EIR) windows. In this structure, dual-band EIR windows arise from the destructive interference caused by the near field coupling between the bright dipole slot and dark quadrupole slot. By embedding graphene ribbons beneath two quadrupole slots, the resonance intensity of two windows can be selectively and actively modulated by adjusting Fermi energy of the corresponding graphene ribbons via electrostatic doping. The theoretical model and field distributions demonstrate that the active tuning behavior can be ascribed to the change in the damper factor of the corresponding dark mode. In addition, the active control of the group delay is further investigated to develop compact slow light devices. Therefore, the selective and active control scheme introduced here can offer new opportunities and platforms for designing multifunctional terahertz devices.

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Dual-band electromagnetically induced transparency effect in a concentrically coupled asymmetric terahertz metamaterial

Cited by 38 publications

References 46 publications

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

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

Graphene-Modulated Terahertz Metasurfaces for Selective and Active Control of Dual-Band Electromagnetic Induced Reflection (EIR) Windows

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