Invisible nanowires with interfering electric and toroidal dipoles

Abstract

By studying the scattering of normally incident planewaves by a single nanowire, we reveal the indispensable role of toroidal multipole excitation in multipole expansions of radiating sources. It is found that for both p-polarized and s-polarized incident waves, toroidal dipoles can be effectively excited within homogenous dielectric nanowires in the optical spectrum regime. We further demonstrate that the plasmonic core-shell nanowires can be rendered invisible through destructive interference of the electric and toroidal dipoles, which may inspire many nanowire based light-matter interaction studies, and incubate biological and medical applications that require non-invasive detections and measurements.

arXiv commentThree Figures; Four pages; Comments welcomed

References in corpus (5)

• Non-Trivial Non-Radiating Excitation as a Mechanism of Resonant Transparency in Toroidal Metamaterials
• All-Dielectric Rod-Type Metamaterials at Optical Frequencies
• Toroidal dipole response in a multifold double-ring metamaterial
• Tailoring dielectric resonator geometries for directional scattering and Huygens' metasurfaces
• Control of light scattering by nanoparticles with optically-induced magnetic responses

Cited by in corpus (22)

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• Nonradiating anapole states in nanophotonics: from fundamentals to applications
• Multipolar interference effects in nanophotonics
• Strongly directional scattering from dielectric nanowires
• Toroidal eigenmodes in all-dielectric metamolecules
• On the dynamic toroidal multipoles from localized electric current distributions
• Non-radiating sources, dynamic anapole and Aharonov-Bohm effect
• Elusive pure anapole excitation in homogenous spherical nanoparticles with radial anisotropy
• Electromagnetic sources beyond common multipoles
• Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles
• Constructive and Destructive Interference of Kerker-type Scattering in an Ultra-thin Silicon Huygens Metasurface
• Scattering invisibility with free-space field enhancement of all-dielectric nanoparticles
• Q-factor enhancement in all-dielectric anisotropic nanoresonators
• Dynamic Anapole in Metasurfaces made of Sculptured Cylinders
• Tuning toroidal dipole resonances in dielectric metamolecules by an additional electric dipolar response
• Photonic band structure and effective medium properties of doubly-resonant core-shell metallo-dielectric nanowire arrays: low-loss, isotropic optical negative-index behavior
• Optical Kerr nonlinearity of arrays of all-dielectric high index nanodisks in the vicinity of the anapole state
• Disorder-immune metasurfaces with constituents exhibiting the anapole mode
• Tunable bilayer dielectric metasurface via stacking magnetic mirrors
• Kerker-Type Positional Disorder Immune Metasurfaces