Magnetic field concentration with coaxial silicon nanocylinders in the optical spectral range

Baryshnikova, Kseniia V.; Novitsky, Andrey; Evlyukhin, Andrey B.; Shalin, Alexander S.

doi:10.1364/josab.34.000d36

Cited by 43 publications

(28 citation statements)

References 32 publications

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“…[] for an electric dipole anapole. Moreover, the ability to realize anapoles of magnetic type opens a room of opportunities for magnetic field concentration, which is of high demand for a variety of applications …”

Section: High‐order Anapole Statesmentioning

confidence: 99%

“…Moreover, the ability to realize anapoles of magnetic type opens a room of opportunities for magnetic field concentration, which is of high demand for a variety of applications. [65][66][67][68][69] For analyzing the role of toroidal terms in the observed anapole states, let us consider Figure 5 showing the basic multipoles together with the full ones in the close vicinity of anapole states.…”

Section: High-order Anapole Statesmentioning

confidence: 99%

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The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Gurvitz

Ladutenko

Dergachev

et al. 2019

Laser & Photonics Reviews

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171

165

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All‐dielectric nanophotonics attracts ever increasing attention nowadays due to the possibility of controlling and configuring light scattering on high‐index semiconductor nanoparticles. It opens a room of opportunities for designing novel types of nanoscale elements and devices, and paves the way for advanced technologies of light energy manipulation. One of the exciting and promising prospects is associated with utilizing the so‐called toroidal moment, being the result of poloidal currents excitation, and anapole states, corresponding to the interference of dipole and toroidal electric moments. Here, higher‐order toroidal moments of both types (up to the electric octupole toroidal moment) are presented and investigated in detail via the direct Cartesian multipole decomposition allowing new near‐ and far‐field configurations to be obtained. Poloidal currents can be associated with vortex‐like distributions of the displacement currents inside nanoparticles, revealing the physical meaning of the high‐order toroidal moments and the convenience of the Cartesian multipoles as an auxiliary tool for analysis. High‐order nonradiating anapole states accompanied by the excitation of intense near‐fields are demonstrated. It is believed that the results are of high importance for both the fundamental understanding of light scattering by high‐index particles and a variety of nanophotonics applications and light governing on nanoscale.

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Section: High‐order Anapole Statesmentioning

confidence: 99%

Section: High-order Anapole Statesmentioning

confidence: 99%

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Gurvitz

Ladutenko

Dergachev

et al. 2019

Laser & Photonics Reviews

Self Cite

171

165

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“…Compared to the plasmonic nanoparticles, which reveal novel optical phenomena due to change in optical density of states [9,10], all-dielectric nanoantennas do not exhibit Joule losses. Desirable overlapping of certain multipole resonances of the dielectric nanoparticles can be used for different applications, including nanoantennas [11][12][13][14], sensors [15,16], solar cell technology [17], and multifunctional metasurfaces [18]. For example, directional light scattering due to the resonant Kerker effect (the overlapping of the electric and magnetic dipole resonances) [19] in the dielectric nanodisks has been used for the experimental realization of Huygens metasurfaces [18,20,21].…”

Section: Introductionmentioning

confidence: 99%

Multipolar response of nonspherical silicon nanoparticles in the visible and near-infrared spectral ranges

et al. 2017

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“…The electric and magnetic dipole resonances are two basic modes that can be readily excited in the structure. Under the frontal excitation, among other parameters, the resonant conditions of these electric and magnetic dipole modes depend crucially on the disk radius and height, respectively …”

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confidence: 99%

Experimental Observation of Toroidal Dipole Modes in All‐Dielectric Metasurfaces

Sayanskiy

Kupriianov

et al. 2018

Advanced Optical Materials

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helix (a solenoid) bent in a ring (a toroid). The current flowing through the helix cre ates a magnetic field trapped inside the toroid. The resulting moment of such a system is oriented along the axis of revo lution of the toroid, and it is defined as a toroidal moment. If the toroid is rigid, then no magnetic field produced by external sources can act on the toroid as a whole. In the nonideal case, an electro magnetic coupling with such a toroidal moment is possible, although one can expect that this effect should be very weak and hardly measurable. Despite this, the toroidal moment was found to exist in different problems of condensed matter physics, and it was studied in many papers. [2][3][4][5] Similar to the standard multipole expansion [6] related to the electromag netic potentials and sources, the toroidal multipoles originated from the decompo sition of the moment tensor have a dual nature. [7] It means that there appears a distinction between magnetic and electric toroidal multipoles manifested in different flow paths of their polarization cur rents. In particular, a magnetic (polar) toroidal dipole is created by the polarization currents flowing on a surface of a toroid along its meridian (the poloidal direction), whereas an electric (axial) toroidal dipole appears from a ring of polarization cur rents flowing along the toroid (the toroidal direction).The study of toroidal dipole modes has attracted a growing attention due to the specific properties of the toroidal electromagnetic response which differs from more familiar electric and magnetic dipole modes. Herein, toroidal dipole modes generated by metasurfaces composed of trimer clusters of high-index dielectric particles are observed. Both far-field transmission measurements and direct near-field mapping of the electromagnetic fields are performed in microwave experiments, and two distinct types of the toroidal dipole modes are observed in a single geometry of the metasurface design, where the toroidal modes are generated either inside of the three- particle clusters (the so-called intra-cluster toroidal modes) or between the neighboring particles in the clusters (inter-cluster toroidal modes). A transient response of the toroidal dipole modes excited by a pulse is studied in detail.Since the metasurface is composed of simple dielectric disks without the use of any metallic components, the proposed design can be feasibly scalable to both micro-and nanometer-size dielectric structures, and it can be employed in the flat-optics platform for realizing the beams shaping and efficient light-matter interaction for multiple hotspot energy localization, nonlinear frequency conversion, and highly efficient trapping of light. Toroidal Dipole ModesAppearance of a toroidal moment is an intriguing phenomenon in the physics of light-matter interaction, first predicted theo retically in the middle of the last century. It was introduced in the particle physics in the study of the interaction with parity violation for elementary particles and weak electromagnetic f...

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Magnetic field concentration with coaxial silicon nanocylinders in the optical spectral range

Cited by 43 publications

References 32 publications

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Multipolar response of nonspherical silicon nanoparticles in the visible and near-infrared spectral ranges

Experimental Observation of Toroidal Dipole Modes in All‐Dielectric Metasurfaces

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