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Propagation oscillations in the near-field response of traveling surface waves launched by metallic nanoapertures

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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.

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Anikeyev, V., Temnov, V.V., Woggon, U. et al. Propagation oscillations in the near-field response of traveling surface waves launched by metallic nanoapertures. Appl. Phys. B 93, 171–176 (2008). https://doi.org/10.1007/s00340-008-3175-3

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  • DOI: https://doi.org/10.1007/s00340-008-3175-3

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