Dual quasi-bound states in the continuum in graphene/dielectric hybrid metamaterial from out-of-plane symmetry protection

Wang, Wudeng; Yan, Hao; Li, Xiong; Zhang, Yujie; Bi, Xiuguo

doi:10.1080/09500340.2021.2024612

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Symmetry protected BIC results from the symmetry incompatibility between bound state and continuum, it can only be generated at the Γ point in the reciprocal space or in the zeroth-order of reflection/transmission 13 – 16 To date, BICs have been employed to enhance and modify the properties of matter due to the unique property as cavities.…”

Section: Introductionmentioning

confidence: 99%

Dual symmetry breaking tunable bound states in the continuum in all dielectric split ring metamaterials

2023

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Dual-symmetry breakings including permittivity asymmetry and geometry asymmetry have been studied in all dielectric split-ring metamaterials supported bound states in the continuum. For any single symmetry breaking, the proposed metamaterials can support simultaneously dual quasi-bound states in the continuum (quasi-BICs). Multipolar decomposition reveals that dual quasi-BICs induced by permittivity asymmetry are both governed by magnetic dipole and electric quadrupole, whereas dual quasi-BICs induced by geometry asymmetry are governed by magnetic dipoles. Under the combined effect of the two types of symmetry breaking, it is found that the quasi-BIC can be weaken and vanished, which is different from enhanced quasi-BIC effect induced by a single symmetry breaking. In addition, asymmetric magnetic and electric field distributions can be realized by selecting different type of symmetry breaking, providing a new way of indirectly manipulating the localized magnetic fields. We show that dual-symmetry breakings point to a unique routine to analyze the physical mechanism of quasi-BICs, which furthermore provide a useful insight into their tuning behavior.

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Section: Introductionmentioning

confidence: 99%

Dual symmetry breaking tunable bound states in the continuum in all dielectric split ring metamaterials

2023

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“…For example, the authors in ref. [17] proposed dual Q-BICs in a silicon stair-like metasurface, where the transmittance can be controlled with respect to a change in the chemical potential of graphene layer. Similarly, the authors in ref.…”

Section: Introductionmentioning

confidence: 99%

Excitation of Tunable Dual Quasi-Bound States in the Continuum in Graphene Metasurface and Terahertz Sensing Application

et al. 2023

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This study proposes an all-graphene metasurface supporting dual band symmetric bound state in the continuum (BIC) in the terahertz (THz) range for the rst time. The structure consists of a unit cell containing a double-gap split ring resonator periodically on a dielectric substrate. By introducing symmetry breaking, two plasmonic quasi-BICs (Q-BICs) transmission dips are observed with nite Qfactors and high modulation depth. Simulation and analysis results simultaneously exhibit that the Qfactors of Q-BICs follow an inverse square dependency with the asymmetry degree. Via changing the graphene's chemical potential, the Q-BICs' operating frequency range can be actively expanded. The dual Q-BICs are immune to the variation of incident angle and has a signi cant slow light effect with time delay up to 23.8 ps. In addition, the sensing performance in THz region is investigated. A maximum sensitivity of 267.5 GHz/RIU is obtained with a FOM of 24.08 RIU − 1 . Our work shows an alternative way to design the class of tunable Q-BIC metasurface, which will provide a valuable reference for future dynamic sensor and other elds.

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Double Symmetry-Protected Bound States in the Continuum in an All-Dielectric Metasurface for Refractive Index Sensing

et al. 2022

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Dual quasi-bound states in the continuum in graphene/dielectric hybrid metamaterial from out-of-plane symmetry protection

Cited by 4 publications

References 35 publications

Dual symmetry breaking tunable bound states in the continuum in all dielectric split ring metamaterials

Dual symmetry breaking tunable bound states in the continuum in all dielectric split ring metamaterials

Excitation of Tunable Dual Quasi-Bound States in the Continuum in Graphene Metasurface and Terahertz Sensing Application

Double Symmetry-Protected Bound States in the Continuum in an All-Dielectric Metasurface for Refractive Index Sensing

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