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.

© 2015 Optical Society of America

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References

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Supplementary Material (3)

NameDescription
» Visualization 1: MOV (187 KB)      The dynamic evolution of fast-switching radiation.
» Visualization 2: MOV (197 KB)      The synchronous resonance along the change of birefringence near quadrupole mode.
» Visualization 3: MOV (2084 KB)      The reversal of vortex handedness and path transform of energy flow in the vicinity of the particle around Fano resonance.

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Equations (8)

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