title: Signal reconstruction from a scanning near-field optical microscopy approach curve.
abstract: 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.
authors.forename: Dominique
authors.initials: D
authors.lastname: Barchiesi
authors.forename: Thomas
authors.initials: T
authors.lastname: Grosges