title: Near-field investigation of porous silicon photoluminescence modification after oxidation in water.
abstract: We report on local photo-induced oxidation of porous silicon in water at room temperature. Starting from a nonluminescent sample, the oxidation process induces luminescence which was found to first increase and then decrease as a function of the oxidation time. A clear blue shift is also observed. This effect is believed to be owing to size modification of silicon nanocrystallites and thus is explained in terms of quantum confinement. Optical near-field images and spectrum are used to monitor the photoluminescence modifications after oxidation. As the photoluminescence can be widely tuned in wavelength and intensity, this method offers a way to pattern the emission properties of the sample.
authors.affiliation: ICD CNRS FRE 2848, Univ. de Technologie de Troyes, Laboratoire de Nanotechnologie et d' Instrumentation Optique, 12 rue Marie Curie, BP 2060, 10010 Troyes Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Juan
authors.forename: J-S
authors.initials: JS
authors.lastname: Bouillard
authors.forename: J
authors.initials: J
authors.lastname: Plain
authors.forename: G
authors.initials: G
authors.lastname: Lerondel
authors.forename: P M
authors.initials: PM
authors.lastname: Adam
authors.forename: R
authors.initials: R
authors.lastname: Bachelot
authors.forename: P
authors.initials: P
authors.lastname: Royer