Absence of toroidal moments in ‘aromagnetic’ anthracene

Alborghetti, S.; Puppin, E.; Brenna, Massimiliano; Pinotti, Ermanno; Zanni, P.; Coey, J. M. D.

doi:10.1088/1367-2630/10/6/063019

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Toroidal coils and molecular structures alike could also display toroidal dipole moments (6,17). The electromagnetic manifestations of the toroidal dipole, however, are usually masked by much stronger effects due to charge and magnetic mul-tipoles, making observations of the toroidal response extremely challenging (14,19,20).…”

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confidence: 99%

Toroidal Dipolar Response in a Metamaterial

Kaelberer

Fedotov

Papasimakis

et al. 2010

Science

734

580

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Toroidal multipoles are fundamental electromagnetic excitations different from those associated with the familiar charge and magnetic multipoles. They have been held responsible for parity violation in nuclear and particle physics, but direct evidence of their existence in classical electrodynamics has remained elusive. We report on the observation of a resonant electromagnetic response in an artificially engineered medium, or metamaterial, that cannot be attributed to magnetic or charge multipoles and can only be explained by the existence of a toroidal dipole. Our direct experimental evidence of the toroidal response brings attention to the often ignored electromagnetic interactions involving toroidal multipoles, which could be present in naturally occurring systems, especially at the macromolecule level, where toroidal symmetry is ubiquitous.

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mentioning

confidence: 99%

Toroidal Dipolar Response in a Metamaterial

Kaelberer

Fedotov

Papasimakis

et al. 2010

Science

734

580

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“…The first resonance occurring in the toroidal family, which is the dipole, can be pictured as the result of magnetic dipoles circling head-to-tail along a loop [107]. The dipole is, however, difficult to spot since it is mostly masked by its conventional counterparts, the electric and magnetic multipoles [108][109][110]. Back in 2009, experiments with toroidal solenoid arrays in the microwave domain yielded the first obscured signatures of toroidal dipoles [111].…”

Section: Toroidal Resonancesmentioning

confidence: 99%

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

Banerjee

Pal

Chowdhury

2020

Journal of Electromagnetic Waves and Applications

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Most electromagnetic phenomena pertaining to metamaterials are observed at the resonance positions. In this review, we have collated and analyze the most prevalent forms of resonance-based phenomena observed in metamaterials to serve as a ready reference for future researchers. Our focus will be on metamaterials operating at the terahertz frequency domain. Starting with the origin and evolution of fundamental LC resonances in metamaterials, we would explain occurrence of typical even and odd higher order resonance modes. We have also discussed Fano resonances in asymmetric gap resonators-based metamaterials. Further, quantum phenomena analogues, such as, electromagnetically induced transparency (EIT) or Plasmon Induced Transparency (PIT), which can significantly influence the metamaterials resonances are also discussed. Thereafter, origins to ultra-sharp resonances in toroidal metamaterials, along with chiral metamaterials and resonance mode hybridization effects in the context of terahertz metamaterials are described. This review should be useful for undertaking.

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“…This is because the effects related to macroscopic toroidization (toroidal response) in naturally occurring materials are weak compared to those resulting from magnetization and polarization (electric and magnetic dipole response). In this situation the presence of bulk toroidization is difficult to detect experimentally [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Gyrotropy and permittivity sensing driven by toroidal response

Marinov

Fedotov

2023

New J. Phys.

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Using a quasi-static model of a toroidal metamaterial we demonstrate analytically that simultaneous excitation of the magnetic and toroidal dipoles in an array of subwavelength toroidal solenoids results in gyrotropic behaviour resembling conventional optical activity. We derive the polarization eigenstates of this uniaxial chiral toroidal metamaterial and show that such a medium is reciprocal, while the eigenstates are represented by two counter-rotating ellipses, one of which can be used for probing changes of the host permittivity in a manner exclusive to the toroidal metamaterial. We also show that the mechanism of permittivity sensing involving resonant toroidal response is fundamentally different from that, which has been exploited so far under the term ‘toroidal’.

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Absence of toroidal moments in ‘aromagnetic’ anthracene

Cited by 6 publications

References 5 publications

Toroidal Dipolar Response in a Metamaterial

Toroidal Dipolar Response in a Metamaterial

Resonance phenomena in electromagnetic metamaterials for the terahertz domain: a review

Gyrotropy and permittivity sensing driven by toroidal response

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