Effects of asymmetric surface corrugations on fully metal-coated scanning near field optical microscopy tips

Valeria Lotito, Urs Sennhauser, Christian Hafner
2010 Optics Express  
We propose a new configuration for a fully metal coated scanning near field (SNOM) probe based on asymmetric corrugations in the metal coating. The variation in the metal surface induces coupling mechanisms leading to the creation of a localized hot spot under linearly polarized excitation. Field localization is an effect of paramount importance for resolution but cannot be achieved with standard axisymmetric fully metal-coated probes, unless a more cumbersome radially polarized excitation is
more » ... zed excitation is used. Our simulations show that this promising structure allows one to simplify the mode injection procedures circumventing the need for a radially polarized beam.
doi:10.1364/oe.18.008722 pmid:20588716 fatcat:qy7gupozrnhwfp7aojhxazvdze