Linear and Nonlinear Fano Resonance on two-dimensional Magnetic Metamaterials

TL;DR

This paper demonstrates the realization and control of both linear and nonlinear Fano resonances in two-dimensional magnetic metamaterials, highlighting their interference effects and tunability in the near-infrared spectrum.

Contribution

It introduces a method to achieve and tune nonlinear Fano resonance in magnetic metamaterials through geometrical design, supported by experimental and theoretical analysis.

Findings

Fano resonance observed in ellipsometric spectra

Nonlinear Fano response tunable near 1.61-1.8 μm

Fano-type modulation of third harmonic generation

Abstract

We demonstrate that both linear and nonlinear Fano resonances can be realized on two dimensional magnetic metamaterials. The Fano resonance comes from the interference between localized magnetic plasmon resonance and propagating surface plasmon polaritons. When studying the linear optical response of the metamaterial structure, this interference phenomenon was observed in the ellipsometric spectrum. By finely tailoring the geometrical parameters of the magnetic metamaterial device, the nonlinear Fano response was tuned to a near-infrared wavelength (1.61-1.8 {\mu}m) of femtosecond pump laser, and Fano-type modulation of the third harmonic generation was found and agrees well with our theoretical model.