Nonradiating sources, dynamic anapole, and Aharonov-Bohm effect

Nemkov, Nikita; Basharin, Alexey A.; Fedotov, V.A.

doi:10.1103/physrevb.95.165134

Cited by 48 publications

(53 citation statements)

References 28 publications

(83 reference statements)

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“…The result of this interference is the reduction of the radiation losses in metamaterials that produces an effect analog to electromagnetically induced transparency (EIT) [14][15][16]. Several works discussed the possibility of radiating vector potentials in the absence of electromagnetic fields leading to the dynamic Aharonov-Bohm effect [3,14,5,17]. These works claimed a high Q-factor associated with toroidal metamaterials to be due to the anapole excitations.…”

Section: And References Therein)mentioning

confidence: 99%

“…These works claimed a high Q-factor associated with toroidal metamaterials to be due to the anapole excitations. This is significant for cloaking behavior and many other applications in photonics and plasmonics demanding strong localized fields, such as nonlinear excitations, high Q -factor cavities of spacers, lasers, qubits [2,15,17,18,19]. As mentioned above, anapole sources might also offer important applications for the dynamic Aharonov-Bohm effect.…”

Section: And References Therein)mentioning

confidence: 99%

“…As mentioned above, anapole sources might also offer important applications for the dynamic Aharonov-Bohm effect. This problem is of interest for many reasons; one of them is the prospect for secure data communication [3,5,14,17,18].…”

Section: And References Therein)mentioning

confidence: 99%

“…In contrast to the Fano-type resonance, the anapole excitation does not require two scattering channels in metamolecules. It is generally accepted that anapole is a mode that occurs as a result of destructive interference between the toroidal and electric dipole moments, which are both radiating [3,6,14,17]. For the ideal anapole, radiation losses are absent due to the above mentioned interference in the far-field zone.…”

Section: And References Therein)mentioning

confidence: 99%

“…This configuration allowed for strengthening of the toroidal moment to detectable level and, simultaneously, weakening of the electric and magnetic moments. Observation of the toroidal response in specially designed threedimensional clusters caused a significant impact on the metamaterial community [2,[12][13][14][15][16][17][18] and gave rise to a series of exciting discoveries in the field of toroidal electrodynamics (see Ref.…”

Section: Introductionmentioning

confidence: 99%

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Extremely high Q -factor metamaterials due to anapole excitation

et al. 2017

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We demonstrate that ideal anapole metamaterials have infinite Q-factor. We have designed and fabricated a metamaterial consisting of planar metamolecules which exhibit anapole behavior in the sense that the electric dipole radiation is almost cancelled by the toroidal dipole one, producing thus an extremely high Q-factor at the resonance frequency. The size of the system, at the mm range, and the parasitic magnetic quadrupole radiation are the factors limiting the size of the Q-factor. In spite of the very low radiation losses the local fields at the metamolecules are extremely high, of the order of 4 10 higher than the external incoming field.

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Section: And References Therein)mentioning

confidence: 99%

Section: And References Therein)mentioning

confidence: 99%

Section: And References Therein)mentioning

confidence: 99%

Section: And References Therein)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extremely high Q -factor metamaterials due to anapole excitation

et al. 2017

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Optical Anapoles: Concepts and Applications

Baryshnikova

Smirnova

Luk’yanchuk

et al. 2019

Advanced Optical Materials

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Interference of electromagnetic modes supported by subwavelength photonic structures is one of the key concepts that underpins the nanoscale control of light in metaoptics. It drives the whole realm of all‐dielectric Mie‐resonant nanophotonics with many applications for low‐loss nanoscale optical antennas, metasurfaces, and metadevices. Specifically, interference of the electric and toroidal dipole moments results in a very peculiar, low‐radiating optical state associated with the concept of optical anapole. Here, the physics of multimode interferences and multipolar interplay in nanostructures is uncovered with an intriguing example of the optical anapole. The recently emerged field of anapole electrodynamics is reviewed, explicating its relevance to multipolar nanophotonics, including direct experimental observations, manifestations in nonlinear optics, and rapidly expanding applications in nanoantennas, active photonics, and metamaterials.

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Unraveling Dipolar Regime and Kerker Conditions in Mid‐Index Mesoscale Dielectric Materials

Coe

Olmos‐Trigo

Qualls

et al. 2022

Advanced Optical Materials

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resonant enhancement of both the electric and magnetic near-fields. [2][3][4] Because of their low losses and strong electromagnetic response, the resonant excitation of dielectric nanostructures offers a unique playground to demonstrate new nanophotonic effects. These include, but are not limited to nonradiating anapole states, [5,6] zero optical backscattering leading to optimum forward scattering, [7,8] magnetic hotspot enhanced Purcell effect, [9,10] surface enhanced Raman scattering, [11] and nanoantenna. [12,13] However, most of these novel nanophotonic effects observed in high refractiveindex lossless dielectric materials are related to the excitation of single dipolar modes-hence so far, they have only been observed in the nanoscale regime at the optical frequencies. In contrast, in the mesoscale regime (where the particle diameter, d is approximately equal to the wavelength of the incident light, λ), these effects are inaccessible due to the contributions from higher order multipolar modes under plane wave (PW) illumination. Recently, there is a growing interest in the study of optical phenomena at mesoscale regime with low refractive index (1< n <2) structures, termed as Mesotronics. [14] In these low-index wavelength-scaled dielectric particles, the electromagnetic fields are enhanced by the interference effects between the different field components generated in or/and near the particle. [14] Even though, the localized field is limited to the particle size of the order of d > λ, a number of interesting phenomena and applications have been observed in these low-index dielectric particles. For example, strong molecule-cavity coupling, [15] optical singularities that form two extreme hotspots near the particle poles, [16] higher order Fano resonances that provide giant magnetic field leading to super-oscillation effects, [17,18] the whispering gallery mode effect overcoming the diffraction limit leading to super-resolution imaging, [19] structured fields in the form of photonic hook and loops allowing new class of "on-chip" optical traps for anisotropic nanoobjects, [20] etc., indicate promising new directions of research enabled by low-index mesoscale dielectric particles.Recently, it was theoretically predicted, [21,22] one can unravel dipolar regimes in a homogenous lossless dielectric sphere with a wide range of size parameter and several refractive indices (n) under illumination with a pure dipolar field (PDF). More specifically, it was shown that the sectoral and propagating Nanophotonic phenomena, such as zero optical back scattering, nonradiating anapole states, etc. are related to the excitation of single dipolar modes-hence so far, they have only been observed within a few relatively high-index dielectric materials (refractive index, n > 3.5) in the nanoscale regime at the optical frequencies. Here, dipolar regime is unraveled, close-to-zero backscattering is demonstrated, and optical anapoles are excited in mid-index dielectric spheres (titanium di-oxide, TiO 2 ; n ≈ 2.6) at the mesoscale reg...

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Nonradiating sources, dynamic anapole, and Aharonov-Bohm effect

Cited by 48 publications

References 28 publications

Extremely high Q -factor metamaterials due to anapole excitation

Extremely high Q -factor metamaterials due to anapole excitation

Optical Anapoles: Concepts and Applications

Unraveling Dipolar Regime and Kerker Conditions in Mid‐Index Mesoscale Dielectric Materials

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