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dc.contributor.authorSchnell, Martin-
dc.contributor.authorGarcía-Etxarri, Aitzol-
dc.contributor.authorAlkorta, J.-
dc.contributor.authorAizpurua, Javier-
dc.contributor.authorHillenbrand, Rainer-
dc.identifier.citationNano Letters 10(9): 3524–3528 (2010)es_ES
dc.description5 páginas, 3 figuras.es_ES
dc.description.abstractWe demonstrate that the local near-field vector and polarization state on planar antenna structures and in nanoscale antenna gaps can be determined by scattering-type near-field optical microscopy (s-SNOM). The near-field vector is reconstructed from the amplitude and phase images of the in- and out-of-plane near-field components obtained by polarization-resolved interferometric detection. Experiments with a mid-infrared inverse bowtie antenna yield a vectorial near-field distribution with unprecedented resolution of about 10 nm and in excellent agreement with numerical simulations. Furthermore, we provide first direct experimental evidence that the nanoscale confined and strongly enhanced fields at the antenna gap are linearly polarized. s-SNOM vector-field mapping paves the way to a full near-field characterization of nanophotonic structures in the broad spectral range between visible and terahertz frequencies, which is essential for future development and quality control of metamaterials, optical sensors, and waveguides.es_ES
dc.description.sponsorshipSupported by the European FP7 project “Nanoantenna” (Health-F5-2009-241818) and the National Project MAT2009-08393 from the Spanish Ministerio de Ciencia e Innovacion. M.S. acknowledges financial support from “Programa de Formación de Personal Investigador” promoted by the Department of Education, Universities and Research of the Basque Government.es_ES
dc.publisherAmerican Chemical Societyes_ES
dc.subjectVector near-field mappinges_ES
dc.subjectNear-field polarization statees_ES
dc.subjectPhase-resolved near-field microscopyes_ES
dc.subjectInfrared antennases_ES
dc.subjectBowtie aperturees_ES
dc.subjectLocal field enhancementes_ES
dc.titlePhase-resolved mapping of the near-field vector and polarization state in nanoscale antenna gapses_ES
dc.description.peerreviewedPeer reviewedes_ES
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