Ultra-directional super-scattering of homogenous spherical particles with radial anisotropy

Liu, Wei

doi:10.1364/oe.23.014734

Cited by 55 publications

(53 citation statements)

References 44 publications

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“…2(C), though different from what is shown in Fig. 1(B), also corresponds to a TD, which however is of a higher mode number with more field lobes [19,27,28] [the magnetic field is also confined within the particle while there are four field intensity peaks across].…”

Section: Td Excitation Within Homogenous and Isotropic Dielectric Parmentioning

confidence: 82%

“…4(A)-(D). It is known that through employing radial anisotropy, P(a 1 ) can be tuned to larger/smaller wavelengths (smaller/larger α) through employing smaller/larger η [28]. Similarly, TD excited within dielectric spheres can also be tuned by adjusting the radial anisotropy parameters, which is clear according to Fig.…”

Section: Tuning the Tds Excited Within Homogenous Dielectric Particlementioning

confidence: 95%

“…For radially anisotropic particles, both the Mie scattering coefficients and the near-fields can be calculated analytically in a similar manner to that of isotropic particles through modifying the expressions of the orders of related spherical Bessel functions to include the anisotropy parameters [28,[30][31][32]. As a result, current J [as is shown in Eq.…”

Section: Tuning the Tds Excited Within Homogenous Dielectric Particlementioning

confidence: 99%

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Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles

et al. 2015

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Abstract:We revisit the fundamental topic of light scattering by single homogenous nanoparticles from the new perspective of excitation and manipulation of toroidal dipoles. It is revealed that besides within all-dielectric particles, toroidal dipoles can also be efficiently excited within homogenous metallic nanoparticles. Moreover, we show that those toroidal dipoles excited can be spectrally tuned through adjusting the radial anisotropy parameters of the materials, which paves the way for further more flexible manipulations of the toroidal responses within photonic systems. The study into toroidal multipole excitation and tuning within nanoparticles deepens our understanding of the seminal problem of light scattering, and may incubate many scattering related fundamental researches and applications.

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Section: Td Excitation Within Homogenous and Isotropic Dielectric Parmentioning

confidence: 82%

Section: Tuning the Tds Excited Within Homogenous Dielectric Particlementioning

confidence: 95%

Section: Tuning the Tds Excited Within Homogenous Dielectric Particlementioning

confidence: 99%

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Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles

et al. 2015

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“…Present works about EQ-magnetic quadrupole (MQ) interferences often adpot material-design strategies. Spherical particles with inhomogeneous material [22], or radial-anisotropy material [23] are designed to achieve the EQ-MQ interference. However, appliable optical structures often prefer flat geometries and consistent homogeneous materials.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of electric quadrupole and magnetic quadrupole coupling in a symmetric silicon structure

Liu

Chen

et al. 2020

New J. Phys.

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Multipole interferences have attracted a lot of interests in last decade due to extraordinary performance on beam control and scattering shaping. However, most of previous works focused on the dipole-based interferences while the quadrupole modes and other high-order multipole modes with unique properties were of less attention. In this work, we aim to expand the present dipole-based multipole-interference regime to the quadrupole-interference regime. We study the interference between an electric quadrupole (EQ) and a magnetic quadrupole (MQ) in both isolated and periodically arranged homogeneous cross dielectric structure. Through structural parametric control, the EQ and MQ can be precisely tuned to share the same resonant intensity at a specific wavelength, resulting in a generalized Kerker effect. Moreover, a dark MQ mode, which is orthogonal with the original MQ mode, arises when we increase the interaction between structure. We find that the spectral approaching between dark MQ and original bright EQ results in an EIT effect and Fanoshaped spectral reflection response. The induced Fano spectrum possesses tunable quality factors varying from ∼10 to >10 5 with the variation of EQ-MQ coupling efficiency. The numerically derived maximum quality factor (238, 618) of the dielectric EQ-MQ coupling system even exceeds the quality factors of many plasmonic resonant systems. We also prove that such spectrum can be adopted to refractive index sensing. Besides, we show that EQ-MQ coupling can bring about rapid 2π phase change, which can be applied in metasurface designs. These results and conclusions about the EQ-MQ interference systems can provide a promising avenue for advanced optical devices.

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“…There are a lot of ways to manipulate light scattering, such as (i) by electric dipole resonance25, (ii) by optically-induced magnetic dipole resonance2627, and (iii) by the interference between electric and magnetic dipole resonances, showing the forward directional scattering while suppressing the backward scattering282930. With the new member of toroidal dipole joining, it brings an extra degree of freedom for light scattering manipulation31.…”

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confidence: 99%

Super-radiating manipulation of a nano-emitter by active toroidal metamaterials

Zhu

Wang

et al. 2017

Sci Rep

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The far-field radiation of a single dipolar emitter can be controlled by coupling to toroidal dipole resonance attached to metallic double flat rings, realizing a conversion from non- to super-radiating. The underlying physical mechanism is the hybridization interference of toroidal and electric dipoles under an asymmetric configuration by introducing a radial displacement of the dipolar emitter. By embedding gain medium in the gap spacer between double flat rings, the directional far-field super-radiating power can achieve a tremendous enhancement with a moderate requirement on the gain coefficient, promoting light-matter interaction manipulation.

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Ultra-directional super-scattering of homogenous spherical particles with radial anisotropy

Cited by 55 publications

References 44 publications

Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles

Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles

Characteristics of electric quadrupole and magnetic quadrupole coupling in a symmetric silicon structure

Super-radiating manipulation of a nano-emitter by active toroidal metamaterials

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