Open AccessOptical gas sensing properties of thermally hydrocarbonized porous silicon Bragg reflectors
Author(s) -
Tero Jalkanen,
V. Torres-Costa,
Jarno Salonen,
M. Björkqvist,
Ermei Mäkilä,
J.M. Martı́nez-Duart,
VesaPekka Lehto
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.005446
Subject(s) - materials science , porous silicon , optics , carbonization , silicon , optoelectronics , porosity , composite material , scanning electron microscope , physics
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.