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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon
 Jirásek, Vít ; Prajzler, Václav ; Remeš, Zdeněk
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.\n
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Characterization of amorphous and microcrystalline Si layers and ZnO layers on glass
 Vaněček, Milan ; Holovský, Jakub ; Poruba, Aleš ; Remeš, Zdeněk ; Purkrt, Adam
Optical and photoelectrical properties of materials from TEL Solar were characterized in the Institute of Physics, AS CR in a broad spectral region and a high dynamic range. Conclusions on material properties with respect to thin film silicon solar cells were drawn.
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