Fano resonant all-dielectric core/shell nanoparticles with ultrahigh scattering directionality in the visible region

Tsuchimoto, Yuta; Yano, Taka-aki; Hayashi, T.; Hara, Masahiko

doi:10.1364/oe.24.014451

Cited by 59 publications

(48 citation statements)

References 36 publications

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“…If we compare Eqs. (11), (15) and (16) with Eq. (17), it can be easily found that F e and F em are increased by a factor of 4cosθ while F m is increased by a factor of 4cos 3 θ when the illumination of single wave is replaced by the two interfering waves.…”

Section: Resultsmentioning

confidence: 99%

“…Very recently, Fano resonances were observed in Si NS dimers and core-shell Si NSs [15,16], which belong to all-dielectric systems, and they were attributed to the interference between the significantly broadened EDs and the nearly unbroadened MDs of the coupled Si NSs or core-shell Si NSs. In these cases, the Fano resonances were observed near the wavelengths of the MDs.…”

Section: Introductionmentioning

confidence: 99%

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Optical pulling and pushing forces exerted on silicon nanospheres with strong coherent interaction between electric and magnetic resonances

et al. 2017

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We investigated theoretically and numerically the optical pulling and pushing forces acting on silicon (Si) nanospheres (NSs) with strong coherent interaction between electric and magnetic resonances. We examined the optical pulling and pushing forces exerted on Si NSs by two interfering waves and revealed the underlying physical mechanism from the viewpoint of electric- and magnetic-dipole manipulation. As compared with a polystyrene (PS) NS, it was found that the optical pulling force for a Si NS with the same size is enlarged by nearly two orders of magnitude. In addition to the optical pulling force appearing at the long-wavelength side of the magnetic dipole resonance, very large optical pushing force is observed at the magnetic quadrupole resonance. The correlation between the optical pulling/pushing force and the directional scattering characterized by the ratio of the forward to backward scattering was revealed. More interestingly, it was found that the high-order electric and magnetic resonances in large Si NSs play an important role in producing optical pulling force which can be generated by not only s-polarized wave but also p-polarized one. Our finding indicates that the strong coherent interaction between the electric and magnetic resonances existing in nanoparticles with large refractive indices can be exploited to manipulate the optical force acting on them and the correlation between the optical force and the directional scattering can be used as guidance. The engineering and manipulation of optical forces will find potential applications in the trapping, transport and sorting of nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical pulling and pushing forces exerted on silicon nanospheres with strong coherent interaction between electric and magnetic resonances

et al. 2017

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“…Coupling of incident light with the oscillations of the phonon polaritons in the dielectric structures along with the near-field coupling between sub-wavelength structures hence give rise to pronounced magnetic-type resonances comparable to the electric resonances. Such magnetic dipolar resonances are observed recently in structures of various geometries like cylinders, disks, cubes and core-shell particles 13 – 20 and further show novel applications such as perfect magnetic mirrors 5 , 6 , Huygens metasurfaces 21 and directional scattering 19 , 20 , 22 . Recently, a related work on optically resonant magneto-electric cubes shows that such structures can act as nanoantennas for ultra-directional light scattering 23 , showing impressive analysis of the scattering fields.…”

Section: Introductionmentioning

confidence: 85%

Collective photonic response of high refractive index dielectric metasurfaces

Amanaganti

Ravnik

Dontabhaktuni

2020

Sci Rep

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Sub-wavelength periodic nanostructures give rise to interesting optical phenomena like effective refractive index, perfect absorption, cloaking, etc. However, such structures are usually metallic which results in high dissipative losses and limitations for use; therefore, dielectric nanostructures are increasingly considered as a strong alternative to plasmonic (metallic) materials. In this work, we show light-matter interaction in a high refractive index dielectric metasurface consisting of an array of cubic dielectric nano-structures made of very high refractive index material, Te in air, using computer modelling. We observe a distinct band-like structure in both transmission and reflection spectra resulting from the near-field coupling of the field modes from neighboring dielectric structures followed by a sharp peak in the transmission at higher frequencies. From the spatial distribution of the electric and magnetic fields and a detailed multipole analysis in both spherical harmonics and Cartesian components, the dominant resonant modes are identified to be electric and magnetic dipoles. Specifically at lower frequency (60 THz) a novel anapole-like state characterized by strong-suppression in reflection and absorption is observed, reported very recently as ‘lattice-invisibility’ state. Differently, at higher frequency (62 THz), strong absorption and near-zero far field scattering are observed, which combined with the field profiles and the multipole analysis of the near-fields indicate the excitation of an anapole. Notably the observed novel modes occur in the simple geometry of dielectric cubes and are a result of collective response of the metasurfaces. Periodicity of the cubic metasurface is shown as the significant material tuning parameter, allowing for the near-field and far-field coupling effects of anapole metasurface. More generally, our work is a contribution towards developing far-fetching applications based on metamaterials such as integrated devices and waveguides consisting of non-radiating modes.

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“…Tiguntseva et al observed the photon‐exciton Fano resonance in the dark‐field spectrum of isolated halide perovskite nanoparticle . Moreover, Fano resonance has been demonstrated theoretically or experimentally in other individual all‐dielectric nanostructures such as Si split‐ring and Si core/shell nanoparticle . However, to date, it remains to be observed in the experiment that Fano resonance originates from the coupling of MD and ED modes produced by an individual all‐dielectric nanoparticle with simple geometry.…”

Section: Introductionmentioning

confidence: 99%

Directional Fano Resonance in an Individual GaAs Nanospheroid

Yan

Huang

et al. 2019

Small

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Fano resonance has been observed in a wide variety of nanophotonic structures such as photonic crystals, plasmonic structures, and metamaterials. It arises from the interference of discrete resonance states with broadband continuum states. As an emerging nanophotonic material, high‐index all‐dielectric nanomaterials provide a new platform to achieve Fano resonance by virtue of the simultaneous excited electric and magnetic resonances. However, to date, Fano resonance in the visible region has not been observed in individual high‐index all‐dielectric nanoparticles. Here, for the first time, the experimental observation of the directional Fano resonance is reported in an individual GaAs nanospheroid. The special geometry enables GaAs nanospheroids to generate spectrally overlapped electric and magnetic dipole resonances, which enhances their spectral coupling, giving rise to asymmetric‐shaped backward scattering spectrum. This directional Fano resonance can be tuned by the aspect ratio of nanospheroids as well as excitation polarization. In addition, efficient directional light scattering is realized at the total scattering peak of the GaAs nanospheroid. The forward‐to‐backward scattering ratio can be largely enhanced due to Fano dip in the backward scattering spectrum. These findings suggest that high‐index all‐dielectric nanospheroid is a promising candidate for directional sources and optical switches.

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Fano resonant all-dielectric core/shell nanoparticles with ultrahigh scattering directionality in the visible region

Cited by 59 publications

References 36 publications

Optical pulling and pushing forces exerted on silicon nanospheres with strong coherent interaction between electric and magnetic resonances

Optical pulling and pushing forces exerted on silicon nanospheres with strong coherent interaction between electric and magnetic resonances

Collective photonic response of high refractive index dielectric metasurfaces

Directional Fano Resonance in an Individual GaAs Nanospheroid

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