Evolution of the resonances of two parallel dielectric cylinders with distance between them

Bulgakov, Evgeny N.; Pichugin, K. N.; Sadreev, Almas F.

doi:10.1103/physreva.100.043806

Cited by 12 publications

(6 citation statements)

References 39 publications

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“…9. If the rods were in air the splitting of frequencies would decrease as 1/L 2 [54]. However a presence of parallel metal planes cardinally changes the interaction between two rods to cancel L-dependence.…”

Section: Fabry-perot Bics: Two Rods Inside Waveguidementioning

confidence: 99%

Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities

2022

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Section: Fabry-perot Bics: Two Rods Inside Waveguidementioning

confidence: 99%

Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities

2022

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“…However, excessive dissipation in metallic nanostructures especially in the near-infrared (NIR) regime has led to a quest for semiconductor materials with low losses that act as dielectrics in the NIR regime away from their absorption band edge [10][11][12] . Studies on Mie resonances in noble metal and dielectric nanowires have been reported previously [13][14][15] , but thus far there have been no systematic studies on the polarization dependence of Mie resonances in metallic or semiconductor nanowires that would also account for their temperature-dependent dielectric permittivities. Furthermore, most attention has been on the generation of dark anapole modes using cylindrical metamaterials characterized by near-zero scattering efficiencies and high absorption efficiencies resulting in significantly enhanced near-field energy 16 .…”

Section: Introductionmentioning

confidence: 99%

Temperature-resilient anapole modes associated with TE polarization in semiconductor nanowire

Thakore¹,

Ala-Nissilä²,

Karttunen³

2022

Preprint

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Polarization-dependent scattering anisotropy of cylindrical nanowires has numerous potential applications in, for example, nanoantennas, photothermal therapy, thermophotovoltaics, catalysis, sensing, optical filters and switches. In all these applications, temperature-dependent material properties play an important role and often adversely impact performance depending on the dominance of either radiative or dissipative damping. Here, we employ numerical modeling based on Mie scattering theory to investigate and compare the temperature and polarization-dependent optical anisotropy of metallic (gold, Au) nanowires with indirect (silicon, Si) and direct (gallium arsenide, GaAs) bandgap semiconducting nanowires. Results indicate that plasmonic scattering resonances in semiconductors, within the absorption band, deteriorate with an increase in temperature whereas those occurring away from the absorption band strengthen as a result of the increase in phononic contribution. Indirect-bandgap thin (20 nm) Si nanowires present low absorption efficiencies for both the transverse electric (TE, E ⊥ ) and magnetic (TM, E ) modes, and high scattering efficiencies for the TM mode at shorter wavelengths making them suitable as highly efficient scatterers. Temperatureresilient higher-order anapole modes with their characteristic high absorption and low scattering efficiencies are also observed in the semiconductor nanowires (r = 125−130 nm) for the TE polarization. Herein, the GaAs nanowires present 3−7 times greater absorption efficiencies compared to the Si nanowires making them especially suitable for temperature-resilient applications such as scanning near-field optical microscopy (SNOM), localized heating, non-invasive sensing or detection that require strong localization of energy in the near field.

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“…In this Letter, we apply a rigorous theoretical approach to study an asymmetrical waveguide coupler operating in the LC-symmetric multimode conditions. The approach is based on the mode-matching technique and expansion of the waveguide fields in terms of cylindrical harmonics [37][38][39]. Such an approach does not suffer from the restrictions on the gain, loss, and mode coupling in the system, and can be extended to couplers with time-varying medium [40].…”

Section: Introductionmentioning

confidence: 99%

Loss compensation symmetry in a multimode waveguide coupler

et al. 2020

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We investigate the loss compensation phenomenon in an asymmetric coupler composed of a pair of unequally sized dielectric cylinders with gain and loss. A multimode analytical approach is applied to solve the eigenvalue problem for the coupler. This approach relies on the field expansion in terms of two sets of orthogonal azimuthal modes, which are coupled due to finite distance between the cylinders. To achieve the loss compensation symmetry (LC-symmetry), a design strategy is developed for the coupler operated in a pair of distinct transverse magnetic modes. It is shown that the LC-symmetry can be achieved for a certain distance between the cylinders, which is associated with the exceptional point of the system. For smaller distances, the adverse impact of high-order azimuthal (hybrid) modes are found to be essential. The results obtained are validated against full-wave simulations.

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Evolution of the resonances of two parallel dielectric cylinders with distance between them

Cited by 12 publications

References 39 publications

Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities

Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities

Temperature-resilient anapole modes associated with TE polarization in semiconductor nanowire

Loss compensation symmetry in a multimode waveguide coupler

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