Apertureless near-field optical microscopy: A study of the local tip field enhancement using photosensitive azobenzene-containing films. - Bachelot, Renaud; H’Dhili, Fekhra; Barchiesi, Dominique; Lerondel, Gilles; Fikri, Radouane; Royer, Pascal; Landraud, Nathalie; Peretti, Jacques; Chaput, Frédéric; Lampel, Georges; Boilot, Jean-Pierre; Lahlil, Khalid (Journal of Applied Physics, 2003)