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System setup of the differential near-field scanning optical microscopy.
(a) Measured image of output field intensity. (b) Measured image of the first derivative of output field intensity. (c) Measured image of the second derivative of output field intensity. (d) The phase image of (b). (e) The phase image of (c). (f) Measured intensity profiles, , , and .
(Color) (a) Reconstructed index profile of the single mode fiber. The inset shows a comparison of the optical field calculated by the known index profile and the measured optical field. (b) The cross section of the index profiles reconstructed from different methods. (i) Direction differentiations of the measured intensity profile. (ii) The intensity profile was smoothed by a Butterworth low-pass filter of order 3. (iii) Fitting a Gaussian profile to the measured field. (iv) Our DNSOM method.
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