title: Optical gas sensing properties of thermally hydrocarbonized porous silicon Bragg reflectors.
abstract: In the present work, porous silicon (PS) based Bragg reflectors are fabricated, and the reactive PS surface is passivated by means of thermal carbonization (TC) by acetylene decomposition. The gas sensing properties of the reflectors are studied with different gas compositions and concentrations. Based on the results it can be concluded that thermally carbonized Bragg reflectors provide an easy and inexpensive means to produce chemically stable high quality PS reflectors with good gas sensing properties, which differ from those of unpassivated PS reflectors.
authors.affiliation: Department of Physics, University of Turku, Turku, Finland. tero.jalkanen@utu.fi
authors.forename: Tero
authors.initials: T
authors.lastname: Jalkanen
authors.forename: Vicente
authors.initials: V
authors.lastname: Torres-Costa
authors.forename: Jarno
authors.initials: J
authors.lastname: Salonen
authors.forename: Mikko
authors.initials: M
authors.lastname: Björkqvist
authors.forename: Ermei
authors.initials: E
authors.lastname: Mäkilä
authors.forename: Jose Manuel
authors.initials: JM
authors.lastname: Martínez-Duart
authors.forename: Vesa-Pekka
authors.initials: VP
authors.lastname: Lehto