Electromagnetically induced transparency metamaterial with strong toroidal dipole response

Shen, Zhaoyang; Yang, Helin; Huang, Xiaojun; Xiang, Tianyu; Wu, Jiong; Zhou, Yanfei; Yu, Zetai

doi:10.1088/2053-1591/ab7f11

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…Figure 12 A shows the variation of the effective RI with wavelength, whereas Figure 12 B illustrates the variation of the group index with change in parameter g. The inset picture indicates the MM geometry. Slow light phenomenon in toroidal EIT based MM has also been reported in another recent study ( Shen et al., 2020 ). They reported the variation of group index and the imaginary part of RI with frequency.…”

Section: Applications Of Toroidal Eitsupporting

confidence: 77%

“…Adapted with permission from ( Han et al., 2018 )© The Optical Society, Figures 7 G–7I). Reprinted from ( Li et al., 2015 ), with the permission of AIP Publishing., Figures 7 J–7L) Adapted from ( Shen et al., 2020 ) with full permission. …”

Section: Excitation Of Toroidal Dipole Based Eitmentioning

confidence: 99%

“…But at the EIT peak of 8.12 GHz, most currents are distributed along the ASSRs and much less along the SRRs indicating the destructive interference between the two which led to the excitation of the EIT window as can be observed from Figure 7 I. A high Q factor EIT, with polarization sensitiveness in the GHz region, was investigated by the combination of an asymmetric SRR (AESRR) and a cut wire (CW) ( Shen et al., 2020 ). The CW acted as a dark mode, whereas the AESRR acted as a bright mode.…”

Section: Excitation Of Toroidal Dipole Based Eitmentioning

confidence: 99%

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Toroidal electromagnetically induced transparency based meta-surfaces and its applications

2022

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Summary The vigorous research on low-loss photonic devices has brought significance to a new kind of electromagnetic excitation, known as toroidal resonances. Toroidal excitation, possessing high-quality factor and narrow linewidth of the resonances, has found profound applications in metamaterial (MM) devices. By the coupling of toroidal dipolar resonance to traditional electric/magnetic resonances, a metamaterial analogue of electromagnetically induced transparency effect (EIT) has been developed. Toroidal induced EIT has demonstrated intriguing properties including steep linear dispersion in transparency windows, often leading to elevated group refractive index in the material. This review summarizes the brief history and properties of the toroidal resonance, its identification in metamaterials, and their applications. Further, numerous theoretical and experimental demonstrations of single and multiband EIT effects in toroidal-dipole-based metamaterials and its applications are discussed. The study of toroidal-based EIT has numerous potential applications in the development of biomolecular sensing, slow light systems, switches, and refractive index sensing.

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Section: Applications Of Toroidal Eitsupporting

confidence: 77%

Section: Excitation Of Toroidal Dipole Based Eitmentioning

confidence: 99%

Section: Excitation Of Toroidal Dipole Based Eitmentioning

confidence: 99%

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Toroidal electromagnetically induced transparency based meta-surfaces and its applications

2022

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“…Shen et al observed EIT via combination of an asymmetric elliptical SRR and cut wires 36 . The combination resulted in an EIT window in the GHz range and the combined structure demonstrated toroidal behaviour 38 . Dynamic manipulation of EIT effect has also been reported in a graphene loaded all dielectric meta surfaces 39 .…”

Section: Introductionmentioning

confidence: 99%

Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial

Bhattacharya

Sarkar

Sharma

et al. 2021

Sci Rep

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The multiband transparency effect in terahertz (THz) domain has intrigued the scientific community due to its significance in developing THz multiband devices. In this article, we have proposed a planar metamaterial geometry comprised of a toroidal split ring resonator (TSRR) flanked by two asymmetric C resonators. The proposed geometry results in multi-band transparency windows in the THz region via strong near field coupling of the toroidal excitation with the dipolar C-resonators of the meta molecule. The geometry displays dominant toroidal excitation as demonstrated by a multipolar analysis of scattered radiation. High Q factor resonances of the metamaterial configuration is reported which can find significance in sensing applications. We report the frequency modulation of transparency windows by changing the separation between TSRR and the C resonators. The numerically simulated findings have been interpreted and validated using an equivalent theoretical model based upon three coupled oscillators system. Such modeling of toroidal resonances may be utilized in future studies on toroidal excitation based EIT responses in metamaterials. Our study has the potential to impact the development of terahertz photonic components useful in building next generation devices.

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“…Traditionally, in order to create a single-band EIT-MM, the requirement is an MM structure consisting of, at least, two different types of resonators [26,27]. So far, to our knowledge, most of the multi-band EIT-MMs have exploited more than three different types of resonators in the structure [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Multi-Band Electromagnetically-Induced-Transparency Metamaterial Based on the Near-Field Coupling of Asymmetric Split-Ring and Cut-Wire Resonators in the GHz Regime

et al. 2021

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A metamaterial (MM), mimicking electromagnetically-induced transparency (EIT) in the GHz regime, was demonstrated numerically and experimentally by exploiting the near-field coupling of asymmetric split-ring and cut-wire resonators. By moving the resonators towards each other, the original resonance dip was transformed to a multi-band EIT. The phenomenon was explained clearly through the excitation of bright and dark modes. The dispersion characteristic of the proposed MM was also investigated, which showed a strongly-dispersive behavior, leading to a high group index and a time delay of the MM. Our work is expected to contribute a simple way to develop the potential devices based on the multi-band EIT effect.

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Electromagnetically induced transparency metamaterial with strong toroidal dipole response

Cited by 16 publications

References 26 publications

Toroidal electromagnetically induced transparency based meta-surfaces and its applications

Toroidal electromagnetically induced transparency based meta-surfaces and its applications

Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial

Multi-Band Electromagnetically-Induced-Transparency Metamaterial Based on the Near-Field Coupling of Asymmetric Split-Ring and Cut-Wire Resonators in the GHz Regime

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