Amplitude- and Phase-Resolved Near-Field Mapping of Infrared Antenna Modes by Transmission-Mode Scattering-Type Near-Field Microscopy

Amplitude- and Phase-Resolved Near-Field Mapping of Infrared Antenna Modes by Transmission-Mode Scattering-Type Near-Field Microscopy

We 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-val...

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Veröffentlicht in:Journal of physical chemistry. C 2010-04, Vol.114 (16), p.7341-7345
Hauptverfasser: Schnell, Martin, Garcia-Etxarri, Aitzol, Huber, Andreas J, Crozier, Kenneth B, Borisov, Andrei, Aizpurua, Javier, Hillenbrand, Rainer
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container_end_page 7345
container_issue 16
container_start_page 7341
container_title Journal of physical chemistry. C
container_volume 114
creator Schnell, Martin
Garcia-Etxarri, Aitzol
Huber, Andreas J
Crozier, Kenneth B
Borisov, Andrei
Aizpurua, Javier
Hillenbrand, Rainer
description We 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.
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