Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon

0471528 - FZÚ 2017 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Jirásek, Vít - Prajzler, Václav - Remeš, Zdeněk
Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon.
NANOCON 2015 Conference Proceedings. Ostrava: Tanger Ltd., 2015 - (Shrbená, J.; Zbořil, R.), s. 39-44. ISBN 978-80-87294-59-8.
[NANOCON 2015. International Conference /7./. Brno (CZ), 14.10.2015-16.10.2015]
Grant CEP: GA ČR(CZ) GA14-05053S
Institucionální podpora: RVO:68378271
Klíčová slova: nanocrystalline diamond * amorphous silicon * optical waveguides * FEM simulations
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Nanocrystalline diamond (NCD) coatings on planar waveguides (WG) in the IR region allow to design optical sensors sensitive to absorbers like proteins or other biomolecules. In this contribution, we present a 2D model of a multi-layer WG developed under FEM (finite element method) simulation software Comsol Multiphysics. The model is based on the modified wave equation solved in the frequency domain and includes optical absorption. It was found that for the single-mode WG working in the narrow region of 1550-2000 nm the silicon thickness must be 150-320 nm. It was found that in order to keep a reasonable signal attenuation, the NCD film must be prepared with the optical absorption coefficient lower than 10 cm-1, being a rather challenging task. Dependencies of the signal attenuation on the NCD film thickness, absorbing layer height, its absorption coefficient and exciting wavelengths are presented.

Trvalý link: http://hdl.handle.net/11104/0268903