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Plasmon‐coupled tip‐enhanced near‐field optical microscopy
Author(s) -
Bouhelier A.,
Renger J.,
Beversluis M. R.,
Novotny L.
Publication year - 2003
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1046/j.1365-2818.2003.01108.x
Subject(s) - surface plasmon , near field scanning optical microscope , materials science , plasmon , optics , waveguide , polarization (electrochemistry) , near and far field , microscopy , nanoscopic scale , near field optics , localized surface plasmon , optical microscope , optoelectronics , physics , nanotechnology , chemistry , scanning electron microscope
Summary Near the cut‐off radius of a guided waveguide mode of a metal‐coated glass fibre tip it is possible to couple radiation to surface plasmons propagating on the outside surface of the metal coating. These surface plasmons converge toward the apex of the tip and interfere constructively for particular polarization states of the initial waveguide mode. Calculations show that a radially polarized waveguide mode can create a strong field enhancement localized at the apex of the tip. The highly localized enhanced field forms a nanoscale optical near‐field source.