Observation of Fano resonance using a coupled resonator metamaterial composed of meta-atoms arranged by double periodicity

TL;DR

This paper demonstrates Fano resonance in a terahertz metamaterial composed of coupled electric split-ring resonators with double periodicity, revealing how mode coupling induces asymmetric spectral features.

Contribution

It introduces a novel metamaterial design with double periodicity that enables observation of Fano resonance through mode coupling effects.

Findings

Fano-like spectral shape observed in transmission spectra

Double periodicity induces mode coupling leading to Fano resonance

Experimental verification in terahertz frequency range

Abstract

We studied the transmission characteristics of a planar metamaterial consisting of an array of electric split-ring resonators (eSRRs) with double periodicity. Because of coupling between different resonant modes induced by different lattice periods in metamaterials with double periodicity, the appearance of Fano resonance can be expected in the same manner as that in the case of coupled classical oscillators. We fabricated complementary eSRRs and verified that a Fano-like spectral shape appeared in the transmission spectra of eSRRs with double periodicity in the terahertz region.