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We describe a method to map the standing-wave pattern inside a Fabry-Perotoptical cavity with sub-wavelength resolution by perturbing it with acommercially available scanning near-field optical microscope (SNOM) tip. Themethod is applied to a fiber Fabry-Perot microcavity. We demonstrate its use todetermine the relative position of the antinodes at two different wavelengths.In addition, we use the SNOM tip as a point-like source allowing precisepositioning of a microscope objective with respect to the cavity mode.

Mapping standing-wave cavity modes with a commercial scanning near-field microscope tip