Gratings can be considered as resonant structures in near-field.
The enhancement of the intensity recorded by Scanning Near-Field
Optical Microscopes (SNOM) is due to interferences in relation with the ratio of
the wavelength to the product of the optical index by the period of the
grating. We discuss the effect of this ratio (in the range 0.9, 1.1) on the
intensity patterns. The influence of the polarization on near-field data is
analyzed in both theoretical computations and experimental result.
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