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Opto-Electronics Review

Editor-in-Chief: Jaroszewicz, Leszek

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Volume 16, Issue 4 (Dec 2008)


Corrugated SNOM probe with enhanced energy throughput

T. Antosiewicz / T. Szoplik
Published Online: 2008-09-27 | DOI: https://doi.org/10.2478/s11772-008-0048-6


In a previous paper we proposed a modification of metal-coated tapered-fibre aperture probes for scanning near-field optical microscopes (SNOMs). The modification consists in radial corrugations of the metal-dielectric interface oriented inward the core. Their purpose is to facilitate the excitation of surface plasmons, which increase the transport of energy beyond the cut-off diameter and radiate a quasi-dipolar field from the probe output rim. An increase in energy output allows for reduction of the apex diameter, which is the main factor determining the resolution of the microscope. In two-dimensional finite-difference time-domain (FDTD) simulations we analyse the performance of the new type of SNOM probe. We admit, however, that the two-dimensional approximation gives better results than expected from exact three-dimensional ones. Nevertheless, optimisation of enhanced energy throughput in corrugated probes should lead to at least twice better resolution with the same sensitivity of detectors available nowadays.

Keywords: scanning near-field optical microscope - SNOM; SNOM resolution; SNOM probes; photon-plasmon coupling; tapered-fibre metal-coated corrugated SNOM probes

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About the article

Published Online: 2008-09-27

Published in Print: 2008-12-01

Citation Information: Opto-Electronics Review, ISSN (Online) 1896-3757, DOI: https://doi.org/10.2478/s11772-008-0048-6.

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© 2008 SEP, Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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