Random terahertz metamaterials

TL;DR

This study investigates how positional disorder affects terahertz metamaterials with split ring resonators, revealing that disorder influences resonance broadening and frequency shifts, with different coupling behaviors at various resonances.

Contribution

It provides experimental insights into the effects of positional disorder on the resonant properties of terahertz metamaterials with SRRs.

Findings

Disorder does not affect the quality factor of the LC resonance.

Dipole resonances broaden and shift with disorder.

Incoherent interaction at LC resonance; coherent coupling at dipole resonance.

Abstract

Using terahertz time domain spectroscopy we investigate the normal incidence transmission through periodically and randomly arranged planar split ring resonators (SRRs). Introduction of positional disorder in metamaterials has no effect on the quality factor of the fundamental Inductive-Capacitive (LC) resonance. The dipole resonances undergo broadening and shift in their resonance frequencies. The experiment reveals that the randomly distributed SRR structures interact incoherently at LC resonance but couple coherently at the higher frequency dipole resonance.