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Scanning near-field field optical microscopy (SNOM) is a technique, whichallows sub-wavelength optical imaging of photonic structures. While theelectric field components of light can be routinely obtained, imaging of themagnetic components has only recently become of interest. This is so due to thedevelopment of artificial materials, which enhance and exploit the typicallyweak magnetic light-matter interactions to offer extraordinary opticalproperties. Consequently, both sources and detectors of the magnetic field oflight are now required.  In this paper, assisted by finite-difference time-domain simulations, wesuggest that the circular aperture at the apex of a metal coated hollow-pyramidSNOM probe can be approximated by a lateral magnetic dipole source. Thisvalidates its use as a detector for the lateral magnetic near-field, asillustrated here for a plasmonic nanobar sample. Verification for a dielectricsample is currently in progress. We experimentally demonstrate the equivalenceof the reciprocal configurations when the probe is used as a source(illumination mode) and as a detector (collection mode). The simplification ofthe probe to a simple magnetic dipole facilitates the simulations and theunderstanding of the near-field images.

Near-field aperture-probe as a magnetic dipole source and optical magnetic field detector