The optical near-field of an aperture tip

Details The optical near-field of an aperture tip The optical near-field of an aperture tip

2007-01-03

arxiv.org/abs/physics/0701034v1

Europhys. Lett. 66, 41 (2004)

Physics

Optics

Scientific paper

10.1209/epl/i2003-10138-7

We use fluorescent nanospheres as scalar detectors for the electric-field intensity in order to probe the near-field of an optical tip used in aperture-type near-field scanning optical microscopy (NSOM). Surprisingly, the recorded fluorescence images show two intensity lobes if the sphere diameter is smaller that the aperture diameter, as expected only in the case of vector detectors like single molecules. We present a simple but realistic, analytical model for the electric field created by light emitted by a NSOM tip which is quantitative agreement with the experimental data.

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