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Spectral Imaging of Individual Split Rings Resonnators

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We have measured the plasmonic eigenfunctions and eigenmodes of individual Split Ring Resonnators, which form a paradigmatic class of photonic atoms. (G. Boudarham et al., Phys. Rev. Lett. (2010))

We report on spectral imaging within individual silver split-ring resonators (SRRs) operating in the near infrared-visible range. We classified the optical eigenmodes from the measurement of their energies and nanometer scale spatial distributions. They are plasmonic standing waves that show great similarities with that of nanoantennas. We, however, evidenced marked differences in the near-field electric field lines’ spatial distribution and the energies’ dispersion.We also showed that the subwavelength defect’s influence on the SRRs’ eigenmodes spatial distribution is small. c