Interplay of Magnetic Responses in All-Dielectric Oligomers To Realize Magnetic Fano Resonances

Hopkins, Ben; Filonov, Dmitry; Miroshnichenko, Andrey E.; Monticone, Francesco; Alù, Andrea; Kivshar, Yuri S.

doi:10.1021/acsphotonics.5b00082

Cited by 106 publications

(90 citation statements)

References 36 publications

(71 reference statements)

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“…The permanent electric dipole moment is closely related to the composite magnetic permeability and complex dielectric constant of materials (Equations 2–4 in SI), and could cause different f m values and absorption bandwidths56575859 as is the case in this study. With an increase in the amount of Co(III) doping, a right shift of f m occurred and the bandwidth of maximal microwave attenuation became significantly larger, albeit with a slight decrease of absorption performance.…”

Section: Resultsmentioning

confidence: 86%

Tunable high-performance microwave absorption for manganese dioxides by one-step Co doping modification

Xiao

et al. 2016

Sci Rep

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The frequencies of microwave absorption can be affected by the permanent electric dipole moment which could be adjusted by modifying the crystal symmetry of the microwave absorbing materials. Herein, we corroborate this strategy experimentally and computationally to the microwave absorption of manganese dioxides. Nanosized Co-doped cryptomelane (Co-Cryp) was successfully synthesized by a one-step reaction. The introduction of Co(III) induced a change of crystal symmetry from tetragonal to monlclinic, which could lead to an increase of its permanent electric dipole moment. As a result, the frequencies of maximum microwave absorption were regulated in the range of 7.4 to 13.9 GHz with a broadened bandwidths. The results suggested that microwave absorption of manganese dioxides can be tailored with Co doping to expand their potential uses for abatement of various microwave pollutions.

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Section: Resultsmentioning

confidence: 86%

Tunable high-performance microwave absorption for manganese dioxides by one-step Co doping modification

Xiao

et al. 2016

Sci Rep

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“…[40][41][42] It would not be uncommon to expect that the toroidal dipolar responses could be induced in all-dielectric oligomer metasurfaces. The near-field coupling between these individual resonators could potentially result in certain fascinating optical phenomena.…”

Section: Resultsmentioning

confidence: 99%

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

Zhang

Lan

Gao

et al. 2019

Advcd Theory and Sims

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Dynamic toroidal multipoles have been attracting an increasing amount of attention, thanks to their unique electromagnetic properties. The concept bears great promises in the field of optical sensing as well as electromagnetic energy localization. Metal-based structures with specific designs have been widely adopted to obtain toroidal responses. However, applications for such structures are often hindered by the significant intrinsic loss when it comes to optical frequencies. Here, several configurations of all-dielectric metasurfaces, in which the meta-molecules are composed of disk oligomers (trimer, quadrumer, pentamer, and hexamer), are proposed to support toroidal dipole resonances in the near-infrared waveband when the polarization of the normally incident excitation plane wave is directed to one of the symmetry axes of the oligomers. Multipole expansion including the toroidal dipole term along with near-field electromagnetic patterns confirms the existence of strong toroidal dipolar responses within certain wavelength ranges. This work would enrich the diversity of the all-dielectric optical systems with toroidal dipole resonances.

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“…Besides, we can observe that a interference between the second TD and the collective magnetic dipole mode creates a dip in scattering spectra, which on the contrary has a relatively high energy as shown in Fig.5 (d). The Fano resonance [35][36][37] resulted from the coupling of conventional electric and magnetic dipole can be seen as an analogy of this phenomenon, since a TD shares same far-field scattering pattern with an electric dipole.…”

Section: Analyses Of Coupling Mechanism In Td Resonancesmentioning

confidence: 99%

Tuning toroidal dipole resonances in dielectric metamolecules by an additional electric dipolar response

Huang

Wang

Zhao

2019

Journal of Applied Physics

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With the rise of artificial magnetism and metamaterials, the toroidal family recently attracts more attention for its unique properties. Here we propose an all-dielectric pentamer metamolecule consisting of nano-cylinders with two toroidal dipolar resonances, whose frequencies, EM distributions and Q factor can be efficiently tuned due to the additional electric dipole mode offered by a central cylinder. To further reveal the underlying coupling effects and formation mechanism of toroidal responses, the multiple scattering theory is adopted. It is found that the first toroidal dipole mode, which can be tuned from 2.21 to 3.55 µm, is mainly induced by a collective electric dipolar resonance, while the second one, which can be tuned from 1.53 to 1.84 µm, relies on the cross coupling of both electric and magnetic dipolar responses. The proposed low-loss metamolecule and modes coupling analyses may pave the way for active design of toroidal responses in advanced optical devices.

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Interplay of Magnetic Responses in All-Dielectric Oligomers To Realize Magnetic Fano Resonances

Cited by 106 publications

References 36 publications

Tunable high-performance microwave absorption for manganese dioxides by one-step Co doping modification

Tunable high-performance microwave absorption for manganese dioxides by one-step Co doping modification

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

Tuning toroidal dipole resonances in dielectric metamolecules by an additional electric dipolar response

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