High Q-factor multi-Fano resonances in all-dielectric double square hollow metamaterials

Li, Hao; Yu, Shilin; Yang, Lei; Zhao, Tonggang

doi:10.1016/j.optlastec.2021.107072

Cited by 74 publications

(23 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fano resonance caused by the interference and coupling between the narrow discrete mode and broad spectrum has been used in many studies [ 23 , 24 , 25 , 26 ]. In recent years, the toroidal-dipole-supported Fano resonance has been implemented to concentrate the electromagnetic field in a small region of the substrate [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Gupta et al, proposed a two-dimensional metamaterial to acquire a Fano resonance derived from the toroidal dipole.…”

Section: Introductionmentioning

confidence: 99%

Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

et al. 2022

View full text Add to dashboard Cite

In this paper, a low-loss toroidal dipole metamaterial composed of four metal split ring resonators is proposed and verified at microwave range. Dual-band Fano resonances could be excited by normal incident electromagnetic waves at 6 GHz and 7.23 GHz. Analysis of the current distribution at the resonance frequency and the scattered power of multipoles shows that both Fano resonances derive from the predominant novel toroidal dipole. The simulation results exhibit that the sensitivity to refractive index of the analyte is 1.56 GHz/RIU and 1.8 GHz/RIU. Meanwhile, the group delay at two Fano peaks can reach to 11.38 ns and 12.85 ns, which means the presented toroidal metamaterial has significant slow light effects. The proposed dual-band toroidal dipole metamaterial may offer a new path for designing ultra-sensitive sensors, filters, modulators, slow light devices, and so on.

show abstract

Section: Introductionmentioning

confidence: 99%

Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Hence, MTD and ETD exhibit a high electromagnetic field confinement, small radiation loss, and weak coupling in free space [31], which is conducive to the formation of resonance with a high Q-factor [32]. Some reports have been published on ETD Fano [33][34][35] and EIT resonance [17]. However, so far, there are only a few studies on the realization of MTD EIT resonance.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically induced transparency based on magnetic toroidal mode of dielectric reverse-symmetric spiral metasurfaces

Fu¹,

Zhou²,

Wang³

et al. 2022

New J. Phys.

View full text Add to dashboard Cite

The intriguing properties of the toroidal mode resonance can potentially promote a low-loss light-matter interaction. This study proposes an electromagnetically induced transparency (EIT) resonance with a high quality factor, which can reach 7798, and low mode volume can reach 0.009 um3, high contrast ratio can reach nearly100%, in the near-infrared region, which is generated by the magnetic toroidal mode in a reverse-symmetric coupling spiral metasurface. A two-oscillator model can only explain the influence of near-field coupling at the EIT point for weak coupling. Moreover, a multipole decomposition method shows that the excitation mechanism of EIT resonances originates from the destructive interference between the subradiant modes (magnetic toroidal dipole-electric quadrupole) and magnetic dipole resonance. Consequently, a new general extinction spectrum interference model is applied to fit all coupling conditions for both weak and strong coupling results that perfectly correspond to the multipole decomposition method. The results of this study could be useful in the analysis and understanding of the electromagnetic coupling characteristics of nanoparticles and provide a design approach for novel metasurfaces for low-loss optical applications.

show abstract

“…In addition, owing to the extremely high sensitivity and low detection threshold of ultrahigh‐Q resonances, BICs also have great application prospects in optical sensing and detection. [ 29,30 ] Recently, chiroptical nanostructures mediated by BICs have been proposed, demonstrating perfect chirality and ultrahigh Q‐factors. [ 31–34 ]…”

Section: Introductionmentioning

confidence: 99%

Dual‐Band Chiral Nonlinear Metasurface Supported by Quasibound States in the Continuum

et al. 2022

View full text Add to dashboard Cite

This paper presents an all-dielectric chiral metasurface composed of an array of two-layer distorted square structures with nanoholes. This metasurface can simultaneously generate dual-band opposite chiral responses, which can be attributed to the bound states in the continuum (BICs) and the distorted chiral structure. By combining the BICs with chirality, a dual-band chiral nonlinear metasurface and a chiral-sensing method are proposed. The simulated results show that the third harmonic generation (THG) conversion efficiency can reach the order of 10 −4 for two peaks with a peak-pump intensity of approximately 5.3 GW cm −2 in the near-infrared region. Moreover, the third-harmonic circular dichroism for each peak can reach up to 0.99 and -0.94, respectively. Furthermore, it is theoretically demonstrated that this metasurface can be used for chiral sensing with high sensitivities. These results provide new insights for linear and nonlinear spin-dependent applications.

show abstract

High Q-factor multi-Fano resonances in all-dielectric double square hollow metamaterials

Cited by 74 publications

References 25 publications

Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

Electromagnetically induced transparency based on magnetic toroidal mode of dielectric reverse-symmetric spiral metasurfaces

Dual‐Band Chiral Nonlinear Metasurface Supported by Quasibound States in the Continuum

Contact Info

Product

Resources

About