Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip
Autor: | Sabri Beldi, Mark D. Thomson, Fritz Keilmann, Nicolas Mecklenbeck, Matthias M. Wiecha, Frederik Walla, Hartmut G. Roskos |
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Rok vydání: | 2017 |
Předmět: |
Microscope
Materials science QC1-999 Physics::Optics 02 engineering and technology 01 natural sciences law.invention 010309 optics Optics law 0103 physical sciences Polariton s-snom Electrical and Electronic Engineering Plasmon business.industry Scattering Physics surface plasmon polaritons 021001 nanoscience & nanotechnology surface waves Surface plasmon polariton Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Near-field scanning optical microscope 0210 nano-technology business near-field microscopy Excitation Biotechnology Localized surface plasmon |
Zdroj: | Nanophotonics, Vol 7, Iss 1, Pp 269-276 (2018) |
ISSN: | 2192-8614 2192-8606 |
Popis: | We investigated the excitation of surface plasmon polaritons on gold films with the metallized probe tip of a scattering-type scanning near-field optical microscope (s-SNOM). The emission of the polaritons from the tip, illuminated by near-infrared laser radiation, was found to be anisotropic and not circularly symmetric as expected on the basis of literature data. We furthermore identified an additional excitation channel via light that was reflected off the tip and excited the plasmon polaritons at the edge of the metal film. Our results, while obtained for a non-rotationally-symmetric type of probe tip and thus specific for this situation, indicate that when an s-SNOM is employed for the investigation of plasmonic structures, the unintentional excitation of surface waves and anisotropic surface wave propagation must be considered in order to correctly interpret the signatures of plasmon polariton generation and propagation. |
Databáze: | OpenAIRE |
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