Fano Resonance in a Subwavelength Mie-based Metamolecule with Split Ring Resonator

TL;DR

This paper demonstrates a method to induce Fano resonance in a subwavelength metamolecule using symmetry-breaking between a split ring resonator and a dielectric cube, with potential applications in light modulation and sensing.

Contribution

It introduces a novel approach to manipulate Mie resonances through symmetry-breaking in a combined SRR and dielectric cube structure, achieving high-Q Fano resonance at microwave frequencies.

Findings

Fano resonance with Q factor of 96 observed at microwave frequencies.

Resonant frequency tunability achieved by altering the dielectric cube's permittivity.

Good agreement between experimental data and simulations.

Abstract

In this letter, we report a method of symmetry-breaking in an artificial Mie-based metamolecule. A Fano resonance with a Q factor of 96 is observed at microwave frequencies in a structure combining a split ring resonator (SRR) and a high-permittivity dielectric cube. Calculations indicate resonant frequency tunability will result from altering the cube's permittivity. The asymmetric spectrum is attributed to both constructive and destructive near-field interactions between the two distinct resonators. Experimental data and simulation results are in good agreement. The underlying physics is seen in field distribution and dipole analysis. This work substantiates an approach for the manipulation of Mie resonances which can potentially be utilized in light modulating and sensing.