Propagation oscillations in the near-field response of traveling surface waves launched by metallic nanoapertures |
| |
Authors: | V. Anikeyev V. V. Temnov U. Woggon E. Devaux T. W. Ebbesen |
| |
Affiliation: | 1.Fachbereich Physik,Universit?t Dortmund,Dortmund,Germany;2.ISIS,Universit’e Louis Pasteur and CNRS (UMR 7006),Strasbourg,France |
| |
Abstract: | We discuss the implications of a frequency-dependent complex dielectric function ε(ω) of a metal for the interpretation of scanning near-field optical microscopy (SNOM) measurements in the vicinity of metallic nanoapertures. For subwavelength slits in gold films we observe distinct spatial intensity oscillations in the near-field signal for specific wavelengths in the visible spectrum. These oscillations of the SNOM signal far away from the nanoslit are ascribed to a constructive interference between the propagating surface plasmon (SP) with light scattered parallel to the gold–air interface. In these spatial SNOM-signal oscillations information about the surface plasmon dielectric function is encoded which can be extracted, for example, in surface plasmon interferometry for applications as sensors or waveguides. |
| |
Keywords: | KeywordHeading" >PACS 78.67.-n 41.20.Jb 68.37.Uv 68.47.De |
本文献已被 SpringerLink 等数据库收录! |