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Communication Dans Un Congrès Année : 2022

Split-ring resonators imaged by THz s-SNOM

Benjamin Walter
  • Fonction : Auteur

Résumé

Split-ring resonators (SRRs) are one of the most common building blocks to design metamaterials operating over a large range of frequencies in the electromagnetic spectrum. Here we acquire s-SNOM images with high signal-to-noise ratio on SRRs by scattering-type scanning near-field optical microscopy (s-SNOM) in the terahertz (THz) domain. By mapping the electric field distribution with subwavelength spatial resolution, we observe clear spatial asymmetries within a single SRR. These effects are more pronounced for the SRRs designed to resonate at the frequency of the probing laser (2.52 THz), compared to the SRRs that do not support a resonant mode at this frequency. This asymmetrical distribution is attributed to combined far-field and near-field multiplication effects, which depend on the position of the probing tip on the micro-resonator.
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Dates et versions

hal-03835305 , version 1 (14-03-2024)

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Cristiane Santos, Theo Hannotte, Louis Thomas, Benjamin Walter, Melanie Lavancier, et al.. Split-ring resonators imaged by THz s-SNOM. 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Aug 2022, Delft, Netherlands. pp.1-2, ⟨10.1109/IRMMW-THz50927.2022.9895984⟩. ⟨hal-03835305⟩
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