Electromagnetic transparency by coated spheres with radial anisotropy

Gao, Lei; Fung, Tung; Yu, Kin Wah; Qiu, Cheng‐Wei

doi:10.1103/physreve.78.046609

Cited by 74 publications

(53 citation statements)

References 43 publications

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“…In this situation, the effective scattering width of the cylinder is determined by m = 0 and m = 1 terms [26,27]. Note that for incident TM wave, the effective permittivity and permeability are still isotropic for radial anisotropy [28,29].…”

Section: Formalismmentioning

confidence: 99%

Plasmonic Resonant Light Scattering by a Cylinder With Radial Anisotropy

Jin¹,

Gao²,

Gao³

2010

PIER

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Abstract-We apply the full-wave electromagnetic theory to study electromagnetic scattering by a small cylindrical particle with radial anisotropy for normally incident light with transverse magnetic (TM) polarization. The scattering coefficients are derived, when the radial anisotropies in both the permittivity and permeability tensors are taken into account. It is shown that the surface and volume plasmon resonances can be identified by the sign of dε t /dq, in which ε t is the permittivity element in a direction tangential to the local r-axis, and q is the size parameter. The near field distributions for surface and volume modes are illustrated by finite element method. It is found that small changes of anisotropy can affect the scattering efficiencies significantly. Moreover, the quadrupole and octupole resonant peaks may be much higher and sharper than those of dipole resonance in the scattering efficiency spectra.

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Section: Formalismmentioning

confidence: 99%

Plasmonic Resonant Light Scattering by a Cylinder With Radial Anisotropy

Jin¹,

Gao²,

Gao³

2010

PIER

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“…Based on scattering theory [28,29], the scattered wave can be regarded as a superposition of TE and TM waves, and we can obtain the scattering coefficients in free space, i.e. A TM n and A TE n [13],…”

Section: Theoretical Modelmentioning

confidence: 99%

“…More recently, it was found that spherical anisotropy plays an important role in achieving the enhancement of nonlinear susceptibilities for second-and third-harmonic generation and controlling resonant frequencies [26]. Furthermore, the suitable adjustment of spherical anisotropy of the coreshell particle can also result in a tunable electromagnetic cloaking [13]. In addition, the near-field and far-field optical properties of coated particles with metallic core and spherically anisotropic shell [2] or with metallic shell and spherically anisotropic core [27] have already been investigated, which are only valid under the electrostatic condition, i.e.…”

mentioning

confidence: 99%

“…On the other hand, the study of electromagnetic interaction with anisotropic core-shell particles has attracted much attention owing to its promising applications in scattering enhancement or suppression, various nano-antennas and novel optical devices [12][13][14][15][16][17]. In general, two types of anisotropies exist in natural and artificially engineered materials: Cartesian anisotropy and spherical anisotropy [18].…”

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confidence: 99%

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Influence of spherical anisotropy on the optical properties of plasmon resonant metallic nanoparticles

Gao

Sang

et al. 2010

Appl. Phys. A

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We demonstrate the features of the dipole and quadrupole resonant modes in extinction spectra of spherically anisotropic nanoparticles based on full-wave scattering theory. It is found that in a core-shell nanosphere, the introduction of spherical anisotropy in the core leads to a blue shift in resonant wavelengths for small nanoparticles, while, for large nanoparticles (core radius larger than 90 nm), the dipole resonant wavelength remains unchanged with the variation of spherical anisotropy. In addition, the peak strengths for the dipole and quadrupole modes are also studied. Numerical simulations show that the strong localization of electric fields can be further enhanced and tuned by adjusting the spherical anisotropy in the core. In contrast, the anisotropy introduced in the shell results in a blue shift for small nanoparticles but a red shift for nanoparticles with larger size. The tunability of plasmon resonant shifts in extinction spectra and tailored localization of enhanced fields are revealed.

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“…Papers [41] and [40] consider using cylindrical RA shells for cloaking purposes, whereas [42,43] focus on the peculiarities of light scattering from plasmonic RA cylinders. For the analysis, occurrence and applications of 3D radially-anisotropic spheres, see [44,45] and the references therein. Mie resonances of anisotropic spheres have also been studied in [46], but the anisotropy is given with respect to rectangular coordinates.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Effective Media by Mie Resonances of Radially-Anisotropic Cylinders

2015

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This paper studies constructing advanced effective materials using arrays of circular radially-anisotropic (RA) cylinders. Homogenization of such cylinders is considered in an electrodynamic case based on Mie scattering theory. The homogenization procedure consists of two steps. First, we present an effectively isotropic model for individual cylinders, and second, we discuss the modeling of a lattice of RA cylinders. Radial anisotropy brings us extra parameters, which makes it possible to adjust the desired effective response for a fixed frequency. The analysis still remains simple enough, enabling a derivation of analytical design equations. The considered applications include generating artificial magnetism using all-dielectric cylinders, which is currently a very sought-after phenomenon in optical frequencies. We also study how negative refraction is achieved using magnetodielectric RA cylinders.

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Electromagnetic transparency by coated spheres with radial anisotropy

Cited by 74 publications

References 43 publications

Plasmonic Resonant Light Scattering by a Cylinder With Radial Anisotropy

Plasmonic Resonant Light Scattering by a Cylinder With Radial Anisotropy

Influence of spherical anisotropy on the optical properties of plasmon resonant metallic nanoparticles

Tailoring Effective Media by Mie Resonances of Radially-Anisotropic Cylinders

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