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Amplitude- and phase-resolved near-field mapping of infrared antenna modes by transmission-mode scattering-type near-field microscopy

AuthorsSchnell, Martin; García-Etxarri, Aitzol ; Borisov, Andrei G.; Aizpurua, Javier ; Hillenbrand, Rainer
Issue Date2010
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 114(16): 7341-7345 (2010)
AbstractWe describe transmission-mode scattering-type near-field optical microscopy (s-SNOM) with interferometric detection. Using this technique, we map the near-field modes of infrared antennas in both amplitude and phase. The use of dielectric probing tips, higher-harmonic demodulation, and a complex-valued subtraction of residual background yields accurate near-field images of the antenna modes. We map metallic nanorods, disks, and triangles, designed for antenna resonance at mid-infrared frequencies, in good agreement with numerical calculations of the modal field distribution. Furthermore, we show that transmission-mode s-SNOM can map the z-component of the antenna near fields. Our results establish a basis for future near-field characterization of complex antenna structures for molecular sensing and spectroscopy.
Description5 páginas, 4 figuras.-- El pdf del artículo es la versión pre-print.-- et al.
Publisher version (URL)http://dx.doi.org/10.1021/jp909252z
Appears in Collections:(CFM) Artículos
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