Probing surface plasmons by bare V-shaped tips: modeling by geometrical optics and rigorous diffraction theory
| Autor: | Heikki Juhana Hyvarinen, Jani Tervo, Jari Turunen, Gaurav Bose |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Diffraction Geometrical optics business.industry Metallic nanostructures Surface plasmon Physics::Optics 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Wedge (geometry) Atomic and Molecular Physics and Optics 010309 optics Optics 0103 physical sciences Microscopy 0210 nano-technology business Plasmon |
| Zdroj: | Optical Review. 24:97-104 |
| ISSN: | 1349-9432 1340-6000 |
| DOI: | 10.1007/s10043-016-0301-z |
| Popis: | We consider probing inhomogeneous waves in the near fields of metallic nanostructures with the aid of a dielectric V-shaped wedge connected to a waveguide. A geometrical model based on the local plane interface approach is proposed to describe the interaction of the wedge with the inhomogeneous field. The fundamental ideas behind the geometrical model are validated by comparison with the results given by rigorous diffraction analysis, and applied to probing plasmonic interference patterns generated by metallic gratings with very narrow slits. The model explains intuitively why a bare wedge with a large apex angle is capable of subwavelength resolution in the spirit of scanning near-field microscopy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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