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Phase-resolved mapping of the near-field vector and polarization state in nanoscale antenna gaps

AuthorsSchnell, Martin; García-Etxarri, Aitzol ; Alkorta, J.; Aizpurua, Javier ; Hillenbrand, Rainer
KeywordsVector near-field mapping
Near-field polarization state
Phase-resolved near-field microscopy
Infrared antennas
Bowtie aperture
Local field enhancement
Issue Date2010
PublisherAmerican Chemical Society
CitationNano Letters 10(9): 3524–3528 (2010)
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.
Description5 páginas, 3 figuras.
Publisher version (URL)http://dx.doi.org/10.1021/nl101693a
Appears in Collections:(CFM) Artículos
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