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We present a direct experimental investigation of the optical fielddistribution around a suspended tapered optical nanofiber by means of afluorescent scanning probe. Using a 100 nm diameter fluorescent bead as a probeof the field intensity, we study interferences made by a nanofiber (400 nmdiameter) scattering a plane wave (568 nm wavelength). Our scanningfluorescence near-field microscope maps the optical field over 36 $\mu$m$^2$,with $\lambda / 5$ resolution, from contact with the surface of the nanofiberto a few micrometers away. Comparison between experiments and Mie scatteringtheory allows us to precisely determine the emitter-nanofiber distance andexperimental drifts.

Imaging light scattered by a subwavelength nanofiber, from near field to far field