Visualizing the near-field coupling and interference of bonding and anti-bonding modes in infrared dimer nanoantennas

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URI: https://hdl.handle.net/10902/30620
ISSN: 1094-4087
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Autoría
Alonso-González, Pablo; Albella Echave, PabloAutoridad Unican; Golmar, Federico; Arzubiaga, Libe; Casanova, Félix; Hueso, Luis E.; Aizpurua, Javier; Hillenbrand, Rainer
Fecha
2013
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© 2013 Optica Publishing Group under the terms of the Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Publicado en
Optics Express, 2013, 21(1), 1270-1280
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Optica Publishing Group
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Palabras clave
Electron beam lithography
Nanoantennas
Near field scanning optical microscopy
Near infrared
Optical antennas
Optical fields
Resumen/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.
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