As new designs of metamaterials rapidly emerge, methods of characterizing their fundamental electromagnetic properties become increasingly important. Here, we utilize the parallel plate waveguide associated with terahertz time-domain spectroscopy experiments to analyze the coupling of terahertz radiation to ultrathin electric split-ring resonators located halfway between the waveguide plates. Our observations determine that the magnetic response dominates across the frequency range of the system. The experimental results are confirmed by simulations, emphasizing the usefulness of the proposed approach for further investigations of magnetic coupling in metamaterials in the terahertz regime.
Parallel plate waveguide (PPWG) terahertz (THz) time domain spectroscopy (TDS) is a powerful tool to investigate the properties of thin and low conductive materials. In this Letter, we determine the lower limit of detection of the PPWG-THz-TDS approach. We provide a closed-form expression of the minimal measurable conductivity by the system. The experimental results of amorphous YBaCuO films indicate that the factor limiting the spectroscopic modality is the waveguide device misalignment. On the other hand, the expression of the minimal detectable conductivity provides a clear scheme of optimization by increasing the waveguide length and therefore enhancing the sensitivity of the system.
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