Coupling between a dark and a bright eigenmode in a terahertz metamaterial

Abstract

Terahertz time domain spectroscopy and rigorous simulations are used to probe the coupling between a dark and a bright plasmonic eigenmode in a metamaterial with broken symmetry. The metamaterial consists of two closely spaced split ring resonators that have their gaps in non-identical positions within the ring. For normal incidence and a fixed polarization both lowest order eigenmodes of the split ring resonators can be excited; although one of them has to be regarded as dark since coupling is prohibited because of symmetry constraints. Emphasis in this work is put on a systematic evaluation of the coupling effects depending on a spectral tuning of both resonances.

References in corpus (3)

• Sharp dark-mode resonances in planar metamaterials with broken structural symmetry
• A metamaterial analog of electromagnetically induced transparency
• Classical Analog of Electromagnetically Induced Transparency

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