Index matching at the nanoscale: Light scattering by core-shell Si/SiOx nanowires

Christian Leiterer, Gerald Brönstrup, Norbert Jahr, Florian Talkenberg, György Zoltán Radnóczi, B. Pécz, Silke Christiansen, Vladimir Sivakov

Research output: Contribution to journalArticle

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 (SiOx) 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.

Original languageEnglish
Article number435202
JournalNanotechnology
Volume27
Issue number43
DOIs
Publication statusPublished - Sep 22 2016

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Keywords

  • core-shell
  • Mie theory
  • nanowire
  • scattering
  • silicon

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Leiterer, C., Brönstrup, G., Jahr, N., Talkenberg, F., Radnóczi, G. Z., Pécz, B., Christiansen, S., & Sivakov, V. (2016). Index matching at the nanoscale: Light scattering by core-shell Si/SiOx nanowires. Nanotechnology, 27(43), [435202]. https://doi.org/10.1088/0957-4484/27/43/435202