Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

Xiang, Tianyu; Lei, Tao; Chen, Ting; Shen, Zhaoyang; Zhang, Jing

doi:10.3390/ma15145013

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…The underlying reason for this is the hybrid coupling between the toroidal dipole, electric dipole and induced highorder resonance modes. This result is superior to those in reported toroidal-based PIT metamaterials, which are usually characterized by a solitary and narrow transparency window [16,29,44].…”

Section: Resultscontrasting

confidence: 63%

Triple-band transparency effect by multiple couplings based on toroidal dipole resonance

Li,

Chang,

Wang

et al. 2024

Mater. Res. Express

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We explored multiple couplings properties in composite metastructure. One part is the asymmetric double rings, supporting the narrow toroidal dipole resonance, and the other component is an upright rod that excites the broad electric dipole resonance. When these two resonant modes coincide in the spectrum, dual-band plasmon induced transparency (PIT) behavior can be obtained, which is attributed to in-phase and out-of-phase couplings between the toroidal dipole and electric dipole modes. Meanwhile, the dual-band features will become a single PIT band by varying the rotation offset angle between the upper- and lower-rings. Moreover, by introducing lateral displacement of the rod with respect to the toroidal component, a triple-band PIT effect can be achieved. In particular, under a large lateral displacement, a broadband transparency window appears across a wavelength range greater than 120 nm, where the transmission exceeds 0.9. It is derived from the hybrid coupling between toroidal dipole, electric dipole and induced high-order resonance modes. The toroidal-based PIT metamaterials not only promote the understanding of toroidal dipole moment but also provide a positive reference for toroidal-based meta-devices.

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Section: Resultscontrasting

confidence: 63%

Triple-band transparency effect by multiple couplings based on toroidal dipole resonance

Li,

Chang,

Wang

et al. 2024

Mater. Res. Express

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“…7, the scattered spectrums with arbitrary TD resonances are used as input of the method to automatically design the metasurfaces. It takes only 2 seconds to batch design three user-required metasurfaces, which is much faster than the parameter optimization process of previous work [34]. The parameters of the designed metasurfaces are (5.9, 1.37, 2.9, 0.3), (6.29, 1.35, 1.63, 0.69) and (7.15, 1.28, 1.63, 1.48) and the scattered spectra of ED, MD and TD obtained from the predicted designs after numerical calculations are shown as circles in Fig.…”

Section: B Reverse Neural Networkmentioning

confidence: 99%

Deep Learning for the Design of Toroidal Metasurfaces

et al. 2023

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In recent years, the toroidal dipoles have had a profound impact on several fields including electromagnetism. However, the on-demand design of toroidal metasurfaces is still a very time-consuming process. In this paper, a method of neural network simulating the nonlinear relationship between the structural parameters of metasurfaces and its multipole scattered powers is proposed based on a deep learning algorithm. The forward network can quickly predict the scattered powers from input structural parameters, which can achieve an accuracy comparable to the electromagnetic simulations. In addition, with the required scattering spectrum as input, the appropriate parameters of the structure could be automatically calculated and then output by the inverse network which can achieve a low mean square error of 0.074 in training set and 0.18 in the test set. Compared with the conventional design process, the proposed deep learning model can guide the design of the toroidal dipole metasurface faster and pave the way for the rapid development of toroidal metasurfaces.

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Actively Tunable and Polarization-Independent Toroidal Resonance in Hybrid Metal-Vanadium Dioxide Metamaterial

Shu

Zhang²,

Yulong³

et al. 2022

J. Electron. Mater.

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Actively tunable and polarization-independent toroidal resonance in hybrid metal-vanadium dioxide metamaterial is proposed and demonstrated numerically in terahertz regime. Simulation results illustrate that a toroidal dipolar resonance is excited by hybrid metal and vanadium dioxide resonator and insensitive with polarization angle of incident plane wave, calculated scattered powers verify the toroidal resonance is strengthened. A novel modulation of resonance strength in proposed toroidal metamaterial is obtained as the phase transition process of vanadium dioxide and contrary to former hybrid metal-vanadium dioxide toroidal metamaterials. The theoretical fitting results reveal that physical mechanism of active modulation in resonance strength can be attributed to the variation of overall damping rate caused by tuning conductivity of vanadium dioxide.

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Low-Loss Dual-Band Transparency Metamaterial with Toroidal Dipole

Cited by 3 publications

References 39 publications

Triple-band transparency effect by multiple couplings based on toroidal dipole resonance

Triple-band transparency effect by multiple couplings based on toroidal dipole resonance

Deep Learning for the Design of Toroidal Metasurfaces

Actively Tunable and Polarization-Independent Toroidal Resonance in Hybrid Metal-Vanadium Dioxide Metamaterial

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