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SNIM measurement setup in the PSTM regime. A laser beam illuminates a sample under the TIR conditions (internal angle ), and a tip measures the tunneling power at a distance from the sample.
Schematic representation of the three-media model, for the TE polarization.
Normalized power detected by a silver halide fiber tip positioned very close to ZnSe (squares) and (circles) TIR elements, at a TIR angle of and a wavelength . The results are given for both the TE and the TM polarizations. The solid lines show the theoretical calculations obtained by the three-media model.
Normalized power detected by a silver halide fiber very close to a element, at , and TIR angles of (squares), and (circles). The solid lines show the theoretical calculations obtained by the three-media model.
Derivative of the signals in Fig. 3 with respect to the tip–sample separation .
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