title: Topological effects in anisotropy-induced nano-fano resonance of a cylinder.
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.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Gao
authors.forename: Lei
authors.initials: L
authors.lastname: Gao
authors.forename: Andrey
authors.initials: A
authors.lastname: Novitsky
authors.forename: Hongli
authors.initials: H
authors.lastname: Chen
authors.forename: Boris
authors.initials: B
authors.lastname: Luk'yanchuk