Abstract
We demonstrate that optical Fano resonance can be induced by the anisotropy of a cylinder rather than frequency selection under the resonant condition. A tiny perturbation in anisotropy can result in a giant switch in the principal optic axis near plasmon resonance. Such anisotropy-induced Fano resonance shows fast reversion between forward and backward scattering at the lowest-energy interference. The near and far fields of the particle change dramatically around Fano resonance. The topology of optical singular points and the trajectory of energy flux distinctly reveal the interaction between the incident wave and the localized surface plasmons, which also determine the far-field scattering pattern. The anisotropy-induced Fano resonance and its high sensitivity open new perspectives on light-matter interactions and promise potential applications in biological sensors, optical switches, and optomechanics.
Highlights
Light scattering by a small particle is one of the most fundamental problems in electrodynamics and has potential applications in information processing, nanotechnologies, and engineering
They were focused on isotropic materials or elements, and Fano resonances were observed versus the fine-tuning of a frequency
This Letter reveals that anisotropy-induced Fano resonance occurs to the anisotropic rod, and its radiation pattern is affected by the subtle perturbation of the rod’s anisotropy
Summary
Light scattering by a small particle is one of the most fundamental problems in electrodynamics and has potential applications in information processing, nanotechnologies, and engineering. These unusual properties are typical Fano resonances that originate from the constructive and destructive interference of a discrete plasmon with a continuum incident light [5,6]. We look into the near field where Poynting bifurcation and vortex analysis [20] are investigated against the anisotropy-induced Fano resonant cases.
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