title: Index matching at the nanoscale: light scattering by core-shell Si/SiO x nanowires.
abstract: Silicon nanowires (SiNWs) show strong resonant wavelength enhancement in terms of absorption as well as scattering of light. However, in most optoelectronic device concepts the SiNWs should be surrounded by a contact layer. Ideally, such a layer can also act as an index matching layer which could nearly halve the strong reflectance of light by silicon. Our results show that this reduction can be overcome at the nanometer scale, i.e. SiNWs embedded in a silica (SiO x ) layer can not only maintain their high scattering cross sections but also their strong polarization dependent scattering. Such effects can be useful for light harvesting or optoelectronic applications. Moreover, we show that it is possible to optically determine the diameters of the embedded nanoscale silicon (Si) cores.
authors.affiliation: Leibniz Institute of Photonic Technology Jena, D-07745 Jena, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Leiterer
authors.forename: Gerald
authors.initials: G
authors.lastname: Brönstrup
authors.forename: Norbert
authors.initials: N
authors.lastname: Jahr
authors.forename: Florian
authors.initials: F
authors.lastname: Talkenberg
authors.forename: György Zoltán
authors.initials: GZ
authors.lastname: Radnóczi
authors.forename: Béla
authors.initials: B
authors.lastname: Pécz
authors.forename: Silke
authors.initials: S
authors.lastname: Christiansen
authors.forename: Vladimir
authors.initials: V
authors.lastname: Sivakov