Birefringence in optical waveguides made by silicon nanocrystal superlattices

We investigate the optical properties of planar waveguides where the core layer is formed by a silicon nanocrystals (Si-nc)∕SiO2 superlattice. M-line measurements of the different waveguides yield the mode indices, which can be modeled by assuming anisotropic optical properties of the core layer. Th...

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Bibliographic Details
Published in:Applied physics letters 2004-08, Vol.85 (7), p.1268-1270
Main Authors: Riboli, F., Navarro-Urrios, D., Chiasera, A., Daldosso, N., Pavesi, L., Oton, C. J., Heitmann, J., Yi, L. X., Scholz, R., Zacharias, M.
Format: Article
Language:English
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Summary:We investigate the optical properties of planar waveguides where the core layer is formed by a silicon nanocrystals (Si-nc)∕SiO2 superlattice. M-line measurements of the different waveguides yield the mode indices, which can be modeled by assuming anisotropic optical properties of the core layer. This anisotropy is related to the superlattice, i.e., it is a form birefringence. By modeling the m-line measurements with the structural data obtained by transmission electron microscopy analysis, we determine for each waveguide the value of the form birefringence, an upper limit of the nanocrystals size and their refractive index. Values of the form birefringence as high as 1% have been found.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1779969