Open AccessSignal reconstruction from a scanning near-field optical microscopy approach curve
Author(s) -
Dominique Barchiesi,
Thomas Grosges
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.006519
Subject(s) - optics , signal (programming language) , ptychography , diffraction , near field scanning optical microscope , near and far field , microscopy , physics , homodyne detection , noise (video) , optical microscope , computer science , artificial intelligence , scanning electron microscope , image (mathematics) , programming language
Scanning Near-field Optical Microscopies suffer from the low signal to noise ratio, due to the smallness of the diffracting probe used to get images. Therefore a lock-in amplifier is commonly used to perform homodyne detection. From the lock-in data, we reconstruct the near-field intensity diffracted by the probe-end in the case of approach curves. We show that the reconstructed and the detected signals can strongly differ. The reconstruction of the signal is necessary to give physical interpretation.