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Abstract: We directly visualize and identify the capacitive coupling of infrared dimer antennas in the near field by employing scattering-type scanning near-field optical microscopy (s-SNOM). The coupling is identified by (i) resolving the strongly enhanced nano-localized near fields in the antenna gap and by (ii) tracing the red shift of the dimer resonance when compared to the resonance of the single antenna constituents. Furthermore, by modifying the illumination geometry we break the symmetry, providing a means to excite both the bonding and the ?dark? anti-bonding modes. By spectrally matching both modes, their interference yields an enhancement or suppression of the near fields at specific locations, which could be useful in nanoscale coherent control applications.
Fuente: Optics Express, 2013, 21(1), 1270-1280
Publisher: Optica Publishing Group
Year of publication: 2013
No. of pages: 11
Publication type: Article
DOI: 10.1364/OE.21.001270
ISSN: 1094-4087
Publication Url: https://doi.org/10.1364/OE.21.001270
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ALONSO-GONZÁLEZ, PABLO
PABLO ALBELLA ECHAVE
GOLMAR, FEDERICO
ARZUBIAGA, LIBE
CASANOVA, FÉLIX
HUESO, LUIS E.
AIZPURUA, JAVIER
HILLENBRAND, RAINER
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