Effects of asymmetric surface corrugations on fully metal-coated scanning near field optical microscopy tips.
- Lotito V EMPA, Swiss Federal Laboratories for Materials Testing and Research, Electronics/Metrology Laboratory, Ueberlandstrasse 129, CH-8600 Dübendorf, Switzerland. Valeria.Lotito@empa.ch
- Sennhauser U
- Hafner C
- 2010-07-01
Published in:
- Optics express. - 2010
English
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 used. Our simulations show that this promising structure allows one to simplify the mode injection procedures circumventing the need for a radially polarized beam.
- Language
-
- English
- Open access status
- green
- Identifiers
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- DOI 10.1364/OE.18.008722
- PMID 20588716
- Persistent URL
- https://sonar.ch/global/documents/61468
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