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Correlating structure and optical emission of nanometric Quantum Emitters

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We have measured the cathodoluminescence of individual GaN quantum discs embedded in GaN/AlGaN nanowires. The measured sizes of the individual QDiscs, which could be as small as 1 nm (4 monolayers) were correlated one to one to their emission wavelengths, showing a marked Quantum confined Starck effect and a clear effect of the local strain on the optical properties of QDiscs. The results just appeared in (L. F. Zagonel et al., Nano Letters (2011)). A video of a recent seminar by L. F. Zagonel has been recently released. Read more »

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

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